Today's study, "Why should mitochondria define species?" published as an open-access article (DOI: 10.14673/HE2018121037) in the journal Human Evolution,
builds on earlier work by Drs. Stoeckle and Thayer, including an examination of the mitochondrial genetic diversity of humans vs. our closest living and extinct relatives. The amount of color variation within each red box of the Klee diagram illustrates the far greater mitochondrial diversity among chimpanzees and bonobos than among living humans. (From the journal Ecology and Evolution, online at https://onlinelibrary.wiley.com/doi/epdf/10.1002/ece3.2394).