Researchers injected zebrafish embryos with a gene that codes for a protein known to control the development of autopods -- primitive versions of hands and feet -- and found that those embryos developed autopods rather than fins. The fish already have the hoxd13 gene, but it produces small amounts of the protein; but when injected with extra copies taken from a mouse, the embryos grew autopods before dying days later.

Full Story:
New Scientist

Related Summaries