How does a zebrafish grow a new tail? The answer may help treat human injuries.

Source: University of Washington
Date: December 26, 2006

Summary:

If a zebrafish loses a chunk of its tail fin, it'll grow back within a week. Like lizards, newts, and frogs, a zebrafish can replace surprisingly complex body parts. A tail fin, for example, has many different types of cells and is a very intricate structure. It is the fish version of an arm or leg. University of Washington researchers have discovered some of the genes and cell-to-cell communication pathways that enable zebrafish to restore their tail fins.