Do fish fins and fingers have a common origin?

We were all fish once – well, our human ancestors were. But how did ocean swimmers evolve to scuttle around on land?

It would have taken a certain dexterity that fins wouldn't have allowed, but fingers and fins seem like such different structures. Scientists have long puzzled over this particular element of the evolutionary leap to land, but now they think they have an idea of how it happened: the same cells that play a role in developing fin bones also contribute to the formation of digit bones.

And this discovery could change how scientists see this major evolutionary transition....
http://www.csmonitor.com/Science/2016/0817/Do-fish-fins-and-fingers-have-a-common-origin