Jocelyn Malamy at the Marine Biological Laboratory made a startling discovery: Clytia hemisphaerica jellyfish can seal wounds in minutes without scarring. Watching transparent medusae under microscope, she observed epithelial cells literally walking together to close damage—a process resembling embryonic healing. This remarkable speed and scar-free recovery offer rare insights into fundamental repair mechanisms.

The jellyfish employ two coordinated structures: lamellipodia, actin-rich cell extensions that crawl like amoebas across basement membranes, and an actomyosin cable that contracts to pull tissues together. Malamy's research in Molecular Biology of the Cell reveals this same mechanism works across all wound sizes, from tiny internal tears to larger gaps requiring collective cell migration.

Understanding these conserved pathways could transform human medicine. Since the cellular processes mirror those in mammals, insights from Clytia's rapid healing may inform treatments for burns, surgical wounds, and chronic injuries where scar tissue formation remains problematic.