{"id":6674,"date":"2026-06-27T23:17:41","date_gmt":"2026-06-27T21:17:41","guid":{"rendered":"https:\/\/zencellowl.com\/?page_id=6674"},"modified":"2026-06-27T23:42:38","modified_gmt":"2026-06-27T21:42:38","slug":"wound-healing-assay","status":"publish","type":"page","link":"https:\/\/zencellowl.com\/de\/wound-healing-assay\/","title":{"rendered":"Wound Healing Assay \u2014 End-to-End Solution"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"6674\" class=\"elementor elementor-6674\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-3e60f6f e-flex e-con-boxed e-con e-parent\" data-id=\"3e60f6f\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-bec8915 elementor-widget elementor-widget-html\" data-id=\"bec8915\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<!-- ============================================================\n     HUB PAGE: Wound Healing Assay \u2014 End-to-End Solution\n     URL: zencellowl.com\/wound-healing-assay\/\n     Elementor \u2192 HTML Block\n     Schema \u2192 Insert Headers & Footers \u2192 Footer Scripts\n     ============================================================ -->\n<style>\n  :root {\n    --teal:   #3aaea0;\n    --teal-d: #2d8f83;\n    --navy:   #1a2e3a;\n    --white:  #ffffff;\n    --off:    #f4f8f8;\n    --gray:   #6b7c85;\n    --border: #d8e6e4;\n    --font:   'Montserrat', sans-serif;\n  }\n  .wh * { box-sizing: border-box; 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border-radius: 4px; padding: 6px 10px; margin-top: 5px; display: inline-block; color: var(--navy); }\n\n  \/* RESULT CARDS *\/\n  .wh-grid3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; margin-top: 28px; }\n  .wh-card { border: 1px solid var(--border); border-radius: 10px; padding: 20px; background: var(--white); }\n  .wh-card h4 { font-size: 14px; font-weight: 700; margin-bottom: 6px; }\n  .wh-card p { font-size: 13px; color: var(--gray); line-height: 1.55; }\n  .wh-card .formula { font-family: monospace; font-size: 12px; background: var(--off); border-radius: 4px; padding: 7px 10px; margin-top: 8px; display: block; color: var(--navy); }\n\n  \/* TROUBLESHOOT GRID *\/\n  .wh-grid2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 16px; margin-top: 28px; }\n\n  \/* FAQ *\/\n  .wh-faq { margin-top: 40px; }\n  .wh-faq details { border-bottom: 1px solid var(--border); }\n  .wh-faq summary { padding: 16px 4px; font-size: 15px; font-weight: 600; color: var(--navy); cursor: pointer; list-style: none; display: flex; justify-content: space-between; align-items: center; }\n  .wh-faq summary::after { content: '+'; color: var(--teal); font-size: 20px; flex-shrink: 0; }\n  .wh-faq details[open] summary::after { content: '\u2212'; }\n  .wh-faq details p { padding: 0 4px 16px; font-size: 14px; color: var(--gray); line-height: 1.7; }\n  .wh-faq details p a { color: var(--teal); text-decoration: none; }\n\n  \/* CTA *\/\n  .wh-cta { background: var(--navy); padding: 72px 40px; text-align: center; }\n  .wh-cta h2 { font-size: clamp(22px, 3vw, 34px); font-weight: 800; color: var(--white); margin-bottom: 14px; }\n  .wh-cta p { color: rgba(255,255,255,.65); font-size: 17px; max-width: 520px; margin: 0 auto 34px; }\n\n  @media(max-width:760px) {\n    .wh-hero, .wh-section, .wh-cta, .wh-pipeline { padding-left: 22px; padding-right: 22px; }\n    .wh-pipe { flex-direction: column; align-items: stretch; gap: 8px; }\n    .wh-pipe-arrow { transform: rotate(90deg); text-align: center; }\n    .wh-btn-ghost { margin-left: 0; margin-top: 10px; display: inline-block; }\n    .wh-highlight { flex-direction: column; }\n  }\n<\/style>\n\n<div class=\"wh\">\n\n<!-- HERO -->\n<section class=\"wh-hero\">\n  <div class=\"wh-eyebrow\">Scratch Assay \u00b7 Wound Healing Assay \u00b7 Migration Assay<\/div>\n  <h1>The complete wound healing assay \u2014<br><span>from scratch to publication-ready data.<\/span><\/h1>\n  <p>Reproducible gap creation. Continuous automated imaging. Automatic analysis. 24 conditions in parallel. Everything from one system, inside your incubator.<\/p>\n  <a href=\"https:\/\/zencellowl.com\/live-remotedemo\/\" class=\"wh-btn\">Book a free demo<\/a>\n  <a href=\"#protocol\" class=\"wh-btn wh-btn-ghost\">See the protocol \u2192<\/a>\n<\/section>\n\n<!-- END-TO-END PIPELINE -->\n<div class=\"wh-pipeline\">\n  <div class=\"wh-pipeline-inner\">\n    <div class=\"wh-pipeline-label\">The complete end-to-end workflow<\/div>\n    <div class=\"wh-pipe\">\n      <div class=\"wh-pipe-step\">\n        <div class=\"num\">Step 1<\/div>\n        <div class=\"title\">Cell seeding<\/div>\n        <div class=\"sub\">Confluent monolayer<\/div>\n      <\/div>\n      <div class=\"wh-pipe-arrow\">\u2192<\/div>\n      <div class=\"wh-pipe-step highlight\">\n        <div class=\"num\">Step 2<\/div>\n        <div class=\"title\">Gap creation<\/div>\n        <div class=\"sub\">ScratchMaker \u00b7 &lt;5% variability<\/div>\n      <\/div>\n      <div class=\"wh-pipe-arrow\">\u2192<\/div>\n      <div class=\"wh-pipe-step highlight\">\n        <div class=\"num\">Step 3<\/div>\n        <div class=\"title\">Imaging<\/div>\n        <div class=\"sub\">zenCELL owl \u00b7 24 wells \u00b7 5 min<\/div>\n      <\/div>\n      <div class=\"wh-pipe-arrow\">\u2192<\/div>\n      <div class=\"wh-pipe-step highlight\">\n        <div class=\"num\">Step 4<\/div>\n        <div class=\"title\">Analysis<\/div>\n        <div class=\"sub\">Auto gap closure \u00b7 CSV export<\/div>\n      <\/div>\n      <div class=\"wh-pipe-arrow\">\u2192<\/div>\n      <div class=\"wh-pipe-step\">\n        <div class=\"num\">Result<\/div>\n        <div class=\"title\">Publication<\/div>\n        <div class=\"sub\">Reproducible \u00b7 peer-reviewed<\/div>\n      <\/div>\n    <\/div>\n  <\/div>\n<\/div>\n\n<!-- WHAT IS -->\n<div class=\"wh-section-bg\">\n  <div class=\"wh-section\">\n    <div class=\"wh-label\">Understanding the assay<\/div>\n    <h2 class=\"wh-h2\">What is a wound healing assay \u2014 and what is the difference to a scratch assay or migration assay?<\/h2>\n    <p class=\"wh-lead\">The three terms describe the same fundamental technique. Knowing the distinctions helps you use the right terminology in publications and grants.<\/p>\n\n    <table class=\"wh-table\">\n      <tr><th>Term<\/th><th>What it means<\/th><th>When to use it<\/th><\/tr>\n      <tr><td>Scratch Assay<\/td><td>The <em>method<\/em>: a gap is physically created in a cell monolayer using a pipette tip, stencil or device<\/td><td>Lab use, describing experimental setup<\/td><\/tr>\n      <tr><td>Wound Healing Assay<\/td><td>The <em>biological model<\/em>: cells migrate to close the gap, mimicking in vivo tissue repair<\/td><td>Regenerative medicine, dermatology, tissue biology context<\/td><\/tr>\n      <tr><td>Cell Migration Assay<\/td><td>The broader <em>category<\/em>: includes scratch, Transwell, Boyden chamber and microfluidics methods<\/td><td>Publications, grant applications, method sections<\/td><\/tr>\n      <tr><td>2D Migration Assay<\/td><td>Specifically the scratch \/ wound healing assay \u2014 as opposed to 3D or insert-based assays<\/td><td>When explicitly distinguishing from 3D invasion assays<\/td><\/tr>\n    <\/table>\n\n    <div class=\"wh-tip\">\n      <strong>The principle \u2014 in one sentence<\/strong>\n      <p>A confluent monolayer of adherent cells is scratched to create a cell-free gap. Cells at the wound edge sense the loss of contact inhibition and migrate collectively to close the gap. The rate and completeness of closure reflects the cells' migratory capacity \u2014 and is directly influenced by treatment, genetics, substrate and growth factors.<\/p>\n    <\/div>\n\n    <h3 class=\"wh-h3\">Scratch Assay vs. Transwell vs. Boyden Chamber \u2014 which to choose?<\/h3>\n    <table class=\"wh-table\">\n      <tr><th>Method<\/th><th>Measures<\/th><th>Kinetics?<\/th><th>Cost<\/th><th>Best for<\/th><\/tr>\n      <tr><td>Scratch \/ Wound Healing Assay<\/td><td>Collective 2D migration<\/td><td class=\"wh-ok\">\u2713 Full timelapse<\/td><td class=\"wh-ok\">Very low<\/td><td>Drug screening, wound healing, cancer invasion models, HTS<\/td><\/tr>\n      <tr><td>Transwell Migration<\/td><td>Individual cell chemotaxis<\/td><td class=\"wh-warn\">Endpoint only<\/td><td class=\"wh-mid\">Medium<\/td><td>Chemotaxis, gradient-driven migration<\/td><\/tr>\n      <tr><td>Boyden Chamber (Invasion)<\/td><td>Invasion through Matrigel<\/td><td class=\"wh-warn\">Endpoint only<\/td><td class=\"wh-warn\">Higher<\/td><td>Invasive potential of cancer cells<\/td><\/tr>\n      <tr><td>\u00b5-Slide Insert (ibidi)<\/td><td>Collective migration, defined gap<\/td><td class=\"wh-ok\">\u2713 If imaged live<\/td><td class=\"wh-mid\">Medium (insert cost)<\/td><td>When ECM damage must be avoided<\/td><\/tr>\n    <\/table>\n  <\/div>\n<\/div>\n\n<!-- THE 3 SOLUTIONS -->\n<div class=\"wh-section\" id=\"solutions\">\n  <div class=\"wh-label\">The zenCELL end-to-end system<\/div>\n  <h2 class=\"wh-h2\">Three products. One complete workflow.<\/h2>\n  <p class=\"wh-lead\">No other system combines reproducible gap creation, automated continuous imaging and built-in analysis in one integrated solution.<\/p>\n\n  <div class=\"wh-solutions\">\n\n    <!-- SCRATCHMAKER -->\n    <div class=\"wh-sol featured\">\n      <div class=\"wh-sol-head\">\n        <div class=\"wh-sol-tag\">Step 2 \u2014 Gap creation \u00b7 New dedicated page<\/div>\n        <h3>ScratchMaker<\/h3>\n        <p>The only light-based, debris-free scratch system. Creates physiologically clean gaps without mechanical damage to cells or ECM. Stencil or UV-LED device \u2014 both compatible with any plate format.<\/p>\n      <\/div>\n      <div class=\"wh-sol-specs\">\n        <div class=\"wh-spec\"><span class=\"k\">Gap width variability<\/span><span class=\"v\">&lt;5%<\/span><\/div>\n        <div class=\"wh-spec\"><span class=\"k\">Method<\/span><span class=\"v\">Light-based \/ stencil<\/span><\/div>\n        <div class=\"wh-spec\"><span class=\"k\">Cell damage<\/span><span class=\"v\">None (no pipette tip)<\/span><\/div>\n        <div class=\"wh-spec\"><span class=\"k\">Formats<\/span><span class=\"v\">6 \u2013 96 well<\/span><\/div>\n        <div class=\"wh-spec\"><span class=\"k\">Throughput<\/span><span class=\"v\">96 scratches in &lt;60 sec (device)<\/span><\/div>\n      <\/div>\n      <div class=\"wh-sol-footer\">\n        <a href=\"https:\/\/zencellowl.com\/scratchmaker\/\" class=\"wh-btn\" style=\"width:100%;text-align:center;display:block;\">Full ScratchMaker details \u2192<\/a>\n      <\/div>\n    <\/div>\n\n    <!-- ZENCELL OWL -->\n    <div class=\"wh-sol featured\">\n      <div class=\"wh-sol-head\">\n        <div class=\"wh-sol-tag\">Step 3 \u2014 Automated imaging<\/div>\n        <h3>zenCELL owl<\/h3>\n        <p>24-channel in-incubator imager. Images every well every 5 minutes \u2014 continuously, automatically, without removing the plate. Gap closure calculated per well at every timepoint.<\/p>\n      <\/div>\n      <div class=\"wh-sol-specs\">\n        <div class=\"wh-spec\"><span class=\"k\">Wells in parallel<\/span><span class=\"v\">24<\/span><\/div>\n        <div class=\"wh-spec\"><span class=\"k\">Min. interval<\/span><span class=\"v\">30 seconds \/ all 24 wells<\/span><\/div>\n        <div class=\"wh-spec\"><span class=\"k\">Analysis<\/span><span class=\"v\">Automatic gap closure, t\u00bd<\/span><\/div>\n        <div class=\"wh-spec\"><span class=\"k\">Export<\/span><span class=\"v\">CSV, PNG, AVI timelapse<\/span><\/div>\n        <div class=\"wh-spec\"><span class=\"k\">Price<\/span><span class=\"v\">\u20ac14,000 \u00b7 no annual fee<\/span><\/div>\n      <\/div>\n      <div class=\"wh-sol-footer\">\n        <a href=\"https:\/\/zencellowl.com\/scratch-assay\/\" class=\"wh-btn\" style=\"width:100%;text-align:center;display:block;\">zenCELL owl scratch assay \u2192<\/a>\n      <\/div>\n    <\/div>\n\n    <!-- PLATES -->\n    <div class=\"wh-sol\">\n      <div class=\"wh-sol-head\">\n        <div class=\"wh-sol-tag\">Consumables<\/div>\n        <h3>ScratchMaker Plates<\/h3>\n        <p>Pre-coated plates optimised for scratch assay cell adhesion and clean gap edges. Available in collagen, fibronectin and standard coating. Sterile, ready to use.<\/p>\n      <\/div>\n      <div class=\"wh-sol-specs\">\n        <div class=\"wh-spec\"><span class=\"k\">Formats<\/span><span class=\"v\">6-well, 24-well, 96-well<\/span><\/div>\n        <div class=\"wh-spec\"><span class=\"k\">Coatings<\/span><span class=\"v\">Collagen \/ Fibronectin \/ Std.<\/span><\/div>\n        <div class=\"wh-spec\"><span class=\"k\">Pack size<\/span><span class=\"v\">5\u00d7 \/ 10\u00d7 pack, sterile<\/span><\/div>\n        <div class=\"wh-spec\"><span class=\"k\">Compatibility<\/span><span class=\"v\">ScratchMaker + any microscope<\/span><\/div>\n      <\/div>\n      <div class=\"wh-sol-footer\">\n        <a href=\"https:\/\/zencellowl.com\/scratchmaker-plates\/\" class=\"wh-btn\" style=\"width:100%;text-align:center;display:block;background:var(--navy);\">View plates \u2192<\/a>\n      <\/div>\n    <\/div>\n  <\/div>\n\n  <div class=\"wh-highlight\">\n    <p>The <strong>manual pipette tip scratch<\/strong> introduces \u00b130\u201360% gap width variability between wells and operators \u2014 making inter-assay comparisons unreliable and affecting migration rate calculations. The <strong>ScratchMaker<\/strong> reduces this to &lt;5%. Combined with <strong>zenCELL owl<\/strong> continuous imaging, you get complete kinetic data across 24 identical gaps simultaneously.<\/p>\n    <div class=\"wh-hl-stat\"><div class=\"n\">&lt;5%<\/div><div class=\"u\">Gap width variability<\/div><\/div>\n    <div class=\"wh-hl-stat\"><div class=\"n\">24<\/div><div class=\"u\">Conditions parallel<\/div><\/div>\n    <div class=\"wh-hl-stat\"><div class=\"n\">Auto<\/div><div class=\"u\">Gap closure analysis<\/div><\/div>\n  <\/div>\n<\/div>\n\n<!-- PROTOCOL -->\n<div class=\"wh-section-bg\" id=\"protocol\">\n  <div class=\"wh-section\">\n    <div class=\"wh-label\">Complete protocol<\/div>\n    <h2 class=\"wh-h2\">Wound Healing Assay Protocol \u2014 Step by Step<\/h2>\n    <p class=\"wh-lead\">Full protocol from cell seeding to data export. Works with manual pipette tip scratch or ScratchMaker system.<\/p>\n\n    <div class=\"wh-steps\">\n      <div class=\"wh-step\">\n        <div class=\"wh-step-num\">1<\/div>\n        <div class=\"wh-step-body\">\n          <h4>Seed cells \u2014 16\u201324h before scratching<\/h4>\n          <p>Seed adherent cells at a density to reach &gt;95% confluence overnight.<\/p>\n          <ul>\n            <li>24-well plate: 100,000\u2013200,000 cells\/well in 500 \u00b5L\u20131 mL complete medium<\/li>\n            <li>Common cell lines: L929 fibroblasts, HaCaT keratinocytes, A549, MDA-MB-231, HeLa, HUVEC<\/li>\n            <li>Incubate at 37\u00b0C, 5% CO\u2082 overnight<\/li>\n          <\/ul>\n          <span class=\"wh-badge wh-badge-gray\">Standard cell seeding protocol<\/span>\n        <\/div>\n      <\/div>\n\n      <div class=\"wh-step\">\n        <div class=\"wh-step-num\">2<\/div>\n        <div class=\"wh-step-body\">\n          <h4>Optional: Mitomycin C pre-treatment (to separate migration from proliferation)<\/h4>\n          <p>Add Mitomycin C (10 \u00b5g\/mL) 2h before scratching to block cell division. Ensures gap closure reflects migration only.<\/p>\n          <ul>\n            <li>Required for: assays &gt;12h, fast-cycling cell lines, drug studies affecting proliferation<\/li>\n            <li>Skip for: short assays (&lt;12h), slowly proliferating primary cells<\/li>\n          <\/ul>\n          <span class=\"wh-badge wh-badge-gray\">\u23f1 2h pre-treatment<\/span>\n        <\/div>\n      <\/div>\n\n      <div class=\"wh-step\">\n        <div class=\"wh-step-num\">3<\/div>\n        <div class=\"wh-step-body\">\n          <h4>Create the scratch \/ wound<\/h4>\n          <p><strong>Option A \u2014 Manual pipette tip:<\/strong> Use a P200 pipette tip held perpendicular (90\u00b0) to the plate. Draw one continuous line in a single motion. Do not back-and-forth. Mark the plate bottom for reference.<\/p>\n          <p style=\"margin-top:8px;\"><strong>Option B \u2014 ScratchMaker (recommended):<\/strong> Place stencil, draw along the precision channel, or use UV-LED device for 96 simultaneous scratches in &lt;60 seconds. &lt;5% width variability guaranteed.<\/p>\n          <span class=\"wh-badge wh-badge-warn\">\u26a0\ufe0f Manual tip: \u00b130\u201360% variability between wells<\/span>\n          <span class=\"wh-badge wh-badge-teal\" style=\"margin-left:6px;\">ScratchMaker: &lt;5% variability<\/span>\n        <\/div>\n      <\/div>\n\n      <div class=\"wh-step\">\n        <div class=\"wh-step-num\">4<\/div>\n        <div class=\"wh-step-body\">\n          <h4>Wash and replace medium \u2014 T=0 starts now<\/h4>\n          <p>Aspirate medium, wash once gently with PBS to remove detached cells and debris. Replace with fresh medium \u00b1 test compound.<\/p>\n          <ul>\n            <li>Low serum (0.5\u20132%) reduces proliferation contribution<\/li>\n            <li>Add compound treatment at this point<\/li>\n            <li>Volume: 500 \u00b5L\/well (24-well) \u2014 avoids turbulence at the wound edge<\/li>\n          <\/ul>\n          <span class=\"wh-badge wh-badge-teal\">T = 0 reference point<\/span>\n        <\/div>\n      <\/div>\n\n      <div class=\"wh-step\">\n        <div class=\"wh-step-num\">5<\/div>\n        <div class=\"wh-step-body\">\n          <h4>Image T=0 \u2014 within 15 minutes of scratching<\/h4>\n          <p>Capture reference images of all wells immediately. This is the baseline wound area for all % closure calculations.<\/p>\n          <p style=\"margin-top:6px;\"><strong>With zenCELL owl:<\/strong> place the plate, set imaging interval (5\u201330 min recommended for scratch assays), press Start. T=0 is captured automatically \u2014 the system runs unattended from here.<\/p>\n          <span class=\"wh-badge wh-badge-teal\">zenCELL owl: fully automated from this point<\/span>\n        <\/div>\n      <\/div>\n\n      <div class=\"wh-step\">\n        <div class=\"wh-step-num\">6<\/div>\n        <div class=\"wh-step-body\">\n          <h4>Monitor gap closure continuously<\/h4>\n          <p>Run the assay until control wells reach 80\u2013100% closure.<\/p>\n          <ul>\n            <li>Fast migrating cells (HeLa, A549, MDA-MB-231): 12\u201318h to closure<\/li>\n            <li>Slow migrating cells (primary fibroblasts, HUVEC): 24\u201372h<\/li>\n            <li>Manual imaging: typical intervals 4h, 8h, 12h, 24h \u2014 kinetics missing between points<\/li>\n            <li>zenCELL owl: every 5\u201330 min, 24\/7, zero incubator disruption, complete kinetic trace<\/li>\n          <\/ul>\n        <\/div>\n      <\/div>\n\n      <div class=\"wh-step\">\n        <div class=\"wh-step-num\">7<\/div>\n        <div class=\"wh-step-body\">\n          <h4>Analyse and export results<\/h4>\n          <p><strong>zenCELL owl (automatic):<\/strong> Software calculates confluence per well at every timepoint \u2192 gap area \u2192 % wound closure \u2192 t\u00bd closure time. Export as CSV for GraphPad Prism or Excel. Export timelapse as AVI video for figures.<\/p>\n          <p style=\"margin-top:6px;\"><strong>ImageJ (manual, free):<\/strong> Use Wound Healing Size Tool plugin (Suarez-Arnedo et al., PLoS ONE 2020, cited 979\u00d7). See full ImageJ guide below.<\/p>\n          <span class=\"wh-badge wh-badge-teal\">Export: CSV \u00b7 PNG \u00b7 AVI<\/span>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/div>\n<\/div>\n\n<!-- IMAGEJ ANALYSIS -->\n<div class=\"wh-section\">\n  <div class=\"wh-label\">Data analysis<\/div>\n  <h2 class=\"wh-h2\">Scratch Assay Analysis \u2014 ImageJ Guide + automated alternative<\/h2>\n  <p class=\"wh-lead\">Two options: manual analysis with the free ImageJ Wound Healing Size Tool, or fully automatic analysis built into zenCELL owl software.<\/p>\n\n  <!-- WHAT TO MEASURE -->\n  <div class=\"wh-grid3\">\n    <div class=\"wh-card\">\n      <h4>% Wound closure<\/h4>\n      <p>Most common readout. Normalised to T=0 area. Comparable across experiments and conditions.<\/p>\n      <span class=\"formula\">% closure = (A\u2080 \u2212 A\u209c) \/ A\u2080 \u00d7 100<\/span>\n    <\/div>\n    <div class=\"wh-card\">\n      <h4>Migration rate (\u00b5m\/h)<\/h4>\n      <p>Average velocity of the cell front. Calculated from wound width reduction over time.<\/p>\n      <span class=\"formula\">Rate = (W\u1d62 \u2212 Wf) \/ (2 \u00d7 t)<\/span>\n    <\/div>\n    <div class=\"wh-card\">\n      <h4>t\u00bd gap closure<\/h4>\n      <p>Time to 50% wound closure. Useful for comparing treatments with different plateau kinetics.<\/p>\n      <span class=\"formula\">Auto-calculated by zenCELL owl<\/span>\n    <\/div>\n  <\/div>\n\n  <!-- IMAGEJ STEPS -->\n  <h3 class=\"wh-h3\">How to analyse scratch assay images in ImageJ \u2014 step by step<\/h3>\n  <p class=\"wh-p\">The most cited free tool is the <strong>Wound Healing Size Tool plugin<\/strong> (Suarez-Arnedo et al., <em>PLoS ONE<\/em> 2020 \u2014 979 citations). It automatically detects wound boundaries and calculates area, width and coverage without manual tracing.<\/p>\n\n  <div class=\"wh-ij\">\n    <div class=\"wh-ij-step\">\n      <div class=\"wh-ij-num\">1<\/div>\n      <div class=\"wh-ij-body\">\n        <h4>Download and install Fiji (ImageJ)<\/h4>\n        <p>Get Fiji from fiji.sc \u2014 free, open-source, includes most plugins pre-installed. Works on Windows, Mac and Linux.<\/p>\n      <\/div>\n    <\/div>\n    <div class=\"wh-ij-step\">\n      <div class=\"wh-ij-num\">2<\/div>\n      <div class=\"wh-ij-body\">\n        <h4>Install the Wound Healing Size Tool plugin<\/h4>\n        <p>Download <strong>Wound_healing_size_tool_updated.zip<\/strong>. Unzip and place the <code>.ijm<\/code> file into <code>Fiji.app\/plugins\/<\/code>. Restart Fiji.<\/p>\n        <span class=\"wh-code\">Plugins \u2192 Wound_healing_size_tool<\/span>\n      <\/div>\n    <\/div>\n    <div class=\"wh-ij-step\">\n      <div class=\"wh-ij-num\">3<\/div>\n      <div class=\"wh-ij-body\">\n        <h4>Open image in 8-bit greyscale<\/h4>\n        <p>File \u2192 Open your image. Convert: Image \u2192 Type \u2192 8-bit. For timelapse: File \u2192 Import \u2192 Image Sequence \u2192 select folder.<\/p>\n        <span class=\"wh-code\">Image \u2192 Type \u2192 8-bit<\/span>\n      <\/div>\n    <\/div>\n    <div class=\"wh-ij-step\">\n      <div class=\"wh-ij-num\">4<\/div>\n      <div class=\"wh-ij-body\">\n        <h4>Set scale (pixels \u2192 \u00b5m)<\/h4>\n        <p>Analyze \u2192 Set Scale \u2192 enter your microscope's pixel\/\u00b5m calibration. Required for migration rate calculation in \u00b5m\/h.<\/p>\n        <span class=\"wh-code\">Analyze \u2192 Set Scale<\/span>\n      <\/div>\n    <\/div>\n    <div class=\"wh-ij-step\">\n      <div class=\"wh-ij-num\">5<\/div>\n      <div class=\"wh-ij-body\">\n        <h4>Run the plugin \u2014 results appear automatically<\/h4>\n        <p>Plugins \u2192 Wound_healing_size_tool. Results window shows: wound area (\u00b5m\u00b2), wound width (\u00b5m), wound coverage (%), width SD. Tick \"Save results\" to auto-export CSV.<\/p>\n        <span class=\"wh-code\">% closure = (1 \u2212 A\u209c\/A\u2080) \u00d7 100<\/span>\n      <\/div>\n    <\/div>\n    <div class=\"wh-ij-step\">\n      <div class=\"wh-ij-num\">6<\/div>\n      <div class=\"wh-ij-body\">\n        <h4>Export and plot in GraphPad Prism or Excel<\/h4>\n        <p>Plot % wound closure vs. time per condition. Compare treatment vs. control. Use paired t-test or two-way ANOVA for statistical analysis across timepoints.<\/p>\n      <\/div>\n    <\/div>\n  <\/div>\n\n  <div class=\"wh-tip\" style=\"margin-top:28px;\">\n    <strong>Other free ImageJ plugins for scratch assay analysis<\/strong>\n    <p><strong>MRI Wound Healing Tool<\/strong> (Montpellier Resources Imagerie) \u2014 coherency-based, analyses cell orientation within the migrating front. &nbsp;|&nbsp; <strong>CSMA<\/strong> (2025, IEEE Access) \u2014 improved detection of cells migrating into the wound centre. &nbsp;|&nbsp; <strong>TScratch<\/strong> \u2014 MATLAB-based, good for batch processing. &nbsp;|&nbsp; <strong>zenCELL owl software<\/strong> \u2014 no plugin installation, fully automatic per well at every timepoint.<\/p>\n  <\/div>\n\n  <div class=\"wh-highlight\">\n    <p><strong>Skip the ImageJ pipeline entirely:<\/strong> zenCELL owl software automatically calculates confluence and gap closure at every imaging timepoint \u2014 no plugin installation, no manual thresholding, no batch processing. Export CSV directly to GraphPad or Excel. Full timelapse available as AVI. 24 wells analysed simultaneously with zero post-processing time.<\/p>\n    <div class=\"wh-hl-stat\"><div class=\"n\">0<\/div><div class=\"u\">Post-processing steps<\/div><\/div>\n    <div class=\"wh-hl-stat\"><div class=\"n\">Auto<\/div><div class=\"u\">Per well, per timepoint<\/div><\/div>\n  <\/div>\n<\/div>\n\n<!-- TROUBLESHOOTING -->\n<div class=\"wh-section-bg\">\n  <div class=\"wh-section\">\n    <div class=\"wh-label\">Troubleshooting<\/div>\n    <h2 class=\"wh-h2\">Common wound healing assay problems \u2014 and how to fix them<\/h2>\n\n    <div class=\"wh-grid2\">\n      <div class=\"wh-card\">\n        <h4>\u26a0\ufe0f Variable scratch width between wells<\/h4>\n        <p><strong>Cause:<\/strong> Manual pipette tip \u2014 operator-dependent angle, pressure, speed.<br>\n        <strong>Fix:<\/strong> Use the <a href=\"https:\/\/zencellowl.com\/scratchmaker\/\" style=\"color:var(--teal);text-decoration:none;font-weight:600;\">ScratchMaker stencil<\/a> for &lt;5% width variation, or UV-LED device for 96 identical scratches in &lt;60 seconds.<\/p>\n      <\/div>\n      <div class=\"wh-card\">\n        <h4>\u26a0\ufe0f Gap closes too quickly<\/h4>\n        <p><strong>Cause:<\/strong> High serum concentration driving proliferation, not migration.<br>\n        <strong>Fix:<\/strong> Reduce serum to 0.5\u20132%, add Mitomycin C (10 \u00b5g\/mL, 2h pre-treatment), or use a wider gap.<\/p>\n      <\/div>\n      <div class=\"wh-card\">\n        <h4>\u26a0\ufe0f Cells detach at the scratch edge<\/h4>\n        <p><strong>Cause:<\/strong> Excessive pipette tip pressure, subconfluent monolayer, inadequate plate coating.<br>\n        <strong>Fix:<\/strong> Ensure &gt;95% confluence, reduce pressure, coat wells with fibronectin (1 \u00b5g\/cm\u00b2) or use ScratchMaker plates.<\/p>\n      <\/div>\n      <div class=\"wh-card\">\n        <h4>\u26a0\ufe0f Cannot separate migration from proliferation<\/h4>\n        <p><strong>Fix:<\/strong> Add Mitomycin C 2h pre-scratch. Or image non-scratched reference wells in parallel with zenCELL owl \u2014 confluence increase in reference wells = proliferation contribution, can be subtracted.<\/p>\n      <\/div>\n      <div class=\"wh-card\">\n        <h4>\u26a0\ufe0f ImageJ fails to detect wound edges<\/h4>\n        <p><strong>Fix:<\/strong> Convert to 8-bit greyscale, enhance contrast (Image \u2192 Adjust \u2192 Brightness\/Contrast), increase threshold parameter in Wound Healing Size Tool. Check cell\/background contrast under brightfield \u2014 phase contrast is easier to threshold.<\/p>\n      <\/div>\n      <div class=\"wh-card\">\n        <h4>\u26a0\ufe0f Results not reproducible between experiments<\/h4>\n        <p><strong>Cause:<\/strong> Variable scratch width + inconsistent imaging timepoints + operator changes.<br>\n        <strong>Fix:<\/strong> ScratchMaker for consistent gaps + zenCELL owl for automated continuous imaging = full reproducibility, no operator dependency.<\/p>\n      <\/div>\n    <\/div>\n  <\/div>\n<\/div>\n\n<!-- FAQ -->\n<div class=\"wh-section\">\n  <div class=\"wh-label\">FAQ<\/div>\n  <h2 class=\"wh-h2\">Frequently asked questions<\/h2>\n  <div class=\"wh-faq\">\n    <details>\n      <summary>What is the difference between a scratch assay and a wound healing assay?<\/summary>\n      <p>The terms are interchangeable in most contexts. \"Scratch assay\" refers to the physical method \u2014 creating a gap by scratching. \"Wound healing assay\" refers to the biological model \u2014 cells migrating to close a wound as in tissue repair in vivo. Both describe the same experimental setup when a monolayer is scratched and gap closure is tracked over time.<\/p>\n    <\/details>\n    <details>\n      <summary>What is the principle of the wound healing assay?<\/summary>\n      <p>A confluent monolayer of adherent cells is scratched to create a cell-free gap. Cells at the wound edge lose contact inhibition and begin migrating collectively to close the gap. The rate of closure reflects the collective migratory capacity \u2014 influenced by treatment, growth factors, substrate, genetic modification or cell type.<\/p>\n    <\/details>\n    <details>\n      <summary>How do I analyse scratch assay images in ImageJ?<\/summary>\n      <p>Use the free <strong>Wound Healing Size Tool<\/strong> plugin (Suarez-Arnedo et al., PLoS ONE 2020, cited 979\u00d7). Install via Fiji \u2192 Plugins, open your image in 8-bit greyscale, run the plugin. It automatically calculates wound area, width and coverage. Export results as CSV for GraphPad Prism. See the full guide in the analysis section above, or use zenCELL owl software for fully automatic gap closure analysis without any ImageJ post-processing.<\/p>\n    <\/details>\n    <details>\n      <summary>What is the difference between the scratch assay and the Transwell migration assay?<\/summary>\n      <p>The scratch assay measures <strong>collective 2D migration<\/strong> \u2014 cells move as a sheet to close a gap. Transwell migration assays measure <strong>individual cell chemotaxis<\/strong> \u2014 single cells migrate through membrane pores toward a gradient. Scratch assays provide kinetic data, are cheaper and simpler. Transwell assays are better for studying directional single-cell migration and invasion through Matrigel (Boyden chamber).<\/p>\n    <\/details>\n    <details>\n      <summary>Do I need Mitomycin C in my scratch assay?<\/summary>\n      <p>For short assays (&lt;12h) with slowly proliferating cells, Mitomycin C is optional. For assays &gt;12h, fast-cycling cell lines (HeLa, A549), or experiments where you need to distinguish migration from proliferation, add Mitomycin C (10 \u00b5g\/mL, 2h pre-treatment). zenCELL owl can also help here \u2014 monitor reference wells without a scratch in parallel, and use their confluence increase as a proliferation control.<\/p>\n    <\/details>\n    <details>\n      <summary>Why is my scratch width not reproducible between wells?<\/summary>\n      <p>Manual pipette tip scratches introduce \u00b130\u201360% width variability depending on operator, angle and pressure. This directly affects migration rate calculations and makes inter-assay comparisons unreliable. The <a href=\"https:\/\/zencellowl.com\/scratchmaker\/\">ScratchMaker<\/a> reduces this to &lt;5% using precision stencils or a UV-LED device \u2014 without mechanical contact with the cells.<\/p>\n    <\/details>\n    <details>\n      <summary>What imaging interval should I use for a wound healing assay?<\/summary>\n      <p>With zenCELL owl: every 5\u201330 minutes is standard for scratch assays. Fast migrating cells (HeLa, MDA-MB-231) need 5\u201310 minute intervals to capture the full kinetic curve. Slowly migrating cells (primary fibroblasts, HUVEC) can be imaged every 30 minutes. The zenCELL owl runs continuously inside the incubator \u2014 all images are stored and available for retrospective analysis at any interval.<\/p>\n    <\/details>\n    <details>\n      <summary>Can zenCELL owl run 24 scratch assay conditions simultaneously?<\/summary>\n      <p>Yes. zenCELL owl monitors up to 24 wells simultaneously inside any standard CO\u2082 incubator. This means 24 different treatment conditions, concentrations, cell lines or time points can be run in a single experiment \u2014 with identical incubator conditions for all wells. Gap closure rate, t\u00bd and migration rate are calculated automatically for each well. <a href=\"https:\/\/zencellowl.com\/live-remotedemo\/\">Book a free 30-minute demo to see it live \u2192<\/a><\/p>\n    <\/details>\n  <\/div>\n<\/div>\n\n<!-- CTA -->\n<section class=\"wh-cta\">\n  <h2>See the complete wound healing assay system in action.<\/h2>\n  <p>30-minute live demo \u2014 real cells, real data, ScratchMaker and zenCELL owl running together inside an incubator.<\/p>\n  <a href=\"https:\/\/zencellowl.com\/live-remotedemo\/\" class=\"wh-btn\">Book your free demo<\/a>\n  <a href=\"https:\/\/zencellowl.com\/scratchmaker\/\" class=\"wh-btn wh-btn-ghost\">ScratchMaker details \u2192<\/a>\n<\/section>\n\n<\/div><!-- \/wh -->\n\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@graph\": [\n    {\n      \"@type\": \"HowTo\",\n      \"name\": \"Wound Healing Assay Protocol \u2014 Complete Step-by-Step Guide\",\n      \"description\": \"How to perform a reproducible wound healing assay (scratch assay \/ cell migration assay) from cell seeding to publication-ready data.\",\n      \"totalTime\": \"PT26H\",\n      \"step\": [\n        { \"@type\": \"HowToStep\", \"name\": \"Seed cells\", \"text\": \"Seed 100,000\u2013200,000 adherent cells per well in a 24-well plate. Incubate 16\u201324h at 37\u00b0C, 5% CO\u2082 until >95% confluent.\" },\n        { \"@type\": \"HowToStep\", \"name\": \"Optional Mitomycin C pre-treatment\", \"text\": \"Add Mitomycin C (10 \u00b5g\/mL) 2h before scratching to block proliferation and ensure gap closure reflects migration only.\" },\n        { \"@type\": \"HowToStep\", \"name\": \"Create the scratch\", \"text\": \"Option A: P200 pipette tip perpendicular to plate, single continuous stroke. Option B: ScratchMaker stencil or UV-LED device for <5% width variability and no mechanical cell damage.\" },\n        { \"@type\": \"HowToStep\", \"name\": \"Wash and replace medium\", \"text\": \"Aspirate medium, wash with PBS, replace with fresh medium \u00b1 compound. T=0 starts now.\" },\n        { \"@type\": \"HowToStep\", \"name\": \"Capture T=0 and start monitoring\", \"text\": \"Image all wells within 15 minutes. With zenCELL owl: place plate, set 5\u201330 min interval, press Start. System runs automatically.\" },\n        { \"@type\": \"HowToStep\", \"name\": \"Monitor until closure\", \"text\": \"Run until control wells reach 80\u2013100% closure (12\u201372h depending on cell line).\" },\n        { \"@type\": \"HowToStep\", \"name\": \"Analyse results\", \"text\": \"zenCELL owl: automatic CSV export of % wound closure, migration rate and t\u00bd per well. ImageJ: use Wound Healing Size Tool plugin (Suarez-Arnedo et al., PLoS ONE 2020).\" }\n      ]\n    },\n    {\n      \"@type\": \"FAQPage\",\n      \"mainEntity\": [\n        {\n          \"@type\": \"Question\",\n          \"name\": \"What is the difference between a scratch assay and a wound healing assay?\",\n          \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"The terms are interchangeable. Scratch assay describes the method (physically creating a gap). Wound healing assay describes the biological model (cells migrating to close the gap). Both refer to the same experimental setup when a monolayer is scratched and gap closure is tracked.\" }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"What is the principle of the wound healing assay?\",\n          \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"A confluent monolayer of adherent cells is scratched to create a cell-free gap. Cells at the wound edge lose contact inhibition and migrate collectively to close the gap. The rate of closure reflects collective migratory capacity, influenced by treatment, growth factors, substrate and genetics.\" }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"How do I analyse scratch assay images with ImageJ?\",\n          \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"Use the free Wound Healing Size Tool plugin (Suarez-Arnedo et al., PLoS ONE 2020, 979 citations). Install in Fiji, open image in 8-bit greyscale, run plugin. It automatically calculates wound area, width and coverage. Export as CSV for GraphPad Prism. Alternatively, zenCELL owl software performs this analysis automatically at every imaging timepoint without post-processing.\" }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"What is the difference between scratch assay and Transwell migration assay?\",\n          \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"Scratch assay measures collective 2D migration of cells closing a gap. Transwell assay measures individual cell chemotaxis through membrane pores toward a gradient. Scratch assays provide kinetic data and are simpler. Transwell is better for directional single-cell migration and invasion.\" }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"Why is my scratch width not reproducible?\",\n          \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"Manual pipette tip scratches introduce \u00b130\u201360% width variability depending on operator, angle and pressure. The ScratchMaker system reduces this to <5% using precision stencils or a UV-LED device without mechanical contact with cells.\" }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"Do I need Mitomycin C in a scratch assay?\",\n          \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"For short assays (<12h) with slowly proliferating cells, Mitomycin C is optional. For assays >12h or fast-cycling cell lines, add Mitomycin C (10 \u00b5g\/mL, 2h pre-treatment) to ensure gap closure reflects migration only and not cell proliferation.\" }\n        }\n      ]\n    }\n  ]\n}\n<\/script>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Scratch Assay \u00b7 Wound Healing Assay \u00b7 Migration Assay The complete wound healing assay \u2014from scratch to publication-ready data. Reproducible gap creation. Continuous automated imaging. Automatic analysis. 24 conditions in [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"class_list":["post-6674","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Wound Healing Assay \u2014 End-to-End System | zenCELL owl<\/title>\n<meta name=\"description\" content=\"Complete wound healing assay system \u2014 reproducible gap, automated imaging with zenCELL, and built-in analysis. 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