Technicolor Zebrafish Reveal How Skin Heals

Every cell on the surface of a transgenic “Skinbow” zebrafish is genetically programmed to glow with a slightly different hue. But this fish wasn’t bred to brighten up an aquarium; the colors effectively stamp each cell with a permanent barcode, letting scientists track its movements in a live animal for weeks at a time. The system is a powerful new tool for watching how hundreds of individual cells work together to regenerate skin tissue.