“Scientists have traced the evolution of the four-chambered human heart to a common genetic factor linked to the development of hearts in turtles and other reptiles. The research shows how a specific protein that turns on genes is involved in heart formation in turtles, lizards and humans.”…
https://www.sciencedaily.com/releases/2009/09/090902133629.htm
https://www.sciencedaily.com/releases/2009/09/090902133629.htm
