Sonic Hedgehog Gene Provides Evidence that our Limbs may have Evolved from Sharks’ Gills
Latest analysis shows that human limbs share a genetic programme with the gills of cartilaginous fishes such as sharks and skates, providing evidence to support a century-old theory on the origin of limbs that had been widely discounted. An idea first proposed 138 years ago that limbs evolved from gills, which has been widely discredited […]