Add Yahoo as a preferred source to see more of our stories on Google. You may never have wondered why you have five fingers at the end of each arm (or why you have fingers at all, for that matter) but ...

The reason we humans have fingers today may all be thanks to a fish's clacker. New research into the origins of digit formation shows that the DNA switch controlling finger and toe development got its ...

To develop their digits, ancestral tetrapods recycled an ancient region of the genome that was initially active in the formation of the fish cloaca. This is illustrated here by the expression of a Hox ...