title: The evolutionary imperative and the origin of the prion pathogen.
authors.forename: D C
authors.initials: DC
authors.lastname: Krakauer
mesh_terms: D000818:Animals; D005075:Biological Evolution; D006801:Humans; D017096:Prion Diseases / Q000209:etiology*; D011328:Prions / Q000472:pathogenicity*
chemical_list: D011328:Prions