11 April 1975
Vol 188, Issue 4184

About The Cover

Chimpanzee (Pan troglodytes trolodytes). Although chimpanzees differ substantially from humans in anatomy and way of life, the proteins and DNA of the two species differ no more than do those of sibling species. See page 107 [Part 1a of plate II by Pierre Dandelot, Paris Museum of Natural History; from A Field Guide to the Larger Mammals of Africa by Jean Dorst, Houghton Mifflin Company, 1970]