| David Gregory & Debbie Marshall Blood clot forming over a wound 2005 Scanning electron micrograph, colour-enhanced Wellcome Collection David Gregory & Debbie Marshall, Wellcome Images (B0006127) LL/36804 A blood clot, with squamous tissue visible beneath. As a blood clot on a surface injury dries out it forms a protective scab over the wound allowing new skin to grow underneath.
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