EVOLUTION Retraction for “A primitive Late Pliocene cheetah, and evolution of the cheetah lineage,” by Per Christiansen and Ji H. Mazák, which appeared in issue 2, January 13, 2009, of Proc Natl Acad Sci USA (106:512–515; first published December 29, 2008; 10.1073/pnas.0810435106).
The undersigned author wishes to note the following: “After further examination, it was determined that the fossil used in the study was a composite specimen from the late Miocene laterite and not from the early Pleistocene loess. The article is hereby retracted.”
Ji H. Mazák