new techniques boost understanding of how fish fins became fingers /

One of the considerable transformations required for the descendants of fish to become creatures that could walk on land was the replacement of long,elegant fin rays by fingers and toes. In the Aug. 17, 2016 issue of Nature, and scientists from the University of Chicago show that the same cells that manufacture fin rays in fish play a central role in forming the fingers and toes of four-legged creatures.

Source: phys.org