Unlike other organisms, Clytia medusae can repair damage so rapidly you can actually watch small wounds close within minutes.

Larger wounds heal in less than an hour, a rate of recovery humans can only dream of. And no scar tissue is formed.

These traits make Clytia a unique window into wound healing. The medusae are transparent, allowing researchers to watch cells move in live animals in real time. Their wounds heal rapidly, and unlike mammals there is no immune system to trigger inflammation around a wound or capillary regeneration to obscure the basic mechanics of repair. As a result, scientists can observe epithelial cells stitching damaged tissue back together.