title: 50 million years of chordate evolution: seeking the origins of adaptive immunity.
authors.affiliation: Department of Pathology, Stanford University School of Medicine, Stanford, CA 94305-5324, USA. dlaird@leland.stanford.edu
authors.forename: D J
authors.initials: DJ
authors.lastname: Laird
authors.forename: A W
authors.initials: AW
authors.lastname: De Tomaso
authors.forename: M D
authors.initials: MD
authors.lastname: Cooper
authors.forename: I L
authors.initials: IL
authors.lastname: Weissman
mesh_terms: D000818:Animals; D005075:Biological Evolution; D006801:Humans; D007109:Immunity