title: MHC evolution: a long-term investment in defense.
authors.forename: T J
authors.initials: TJ
authors.lastname: Gill
mesh_terms: D000818:Animals; D005075:Biological Evolution; D008285:Major Histocompatibility Complex / Q000235:genetics*; D051379:Mice; D011110:Polymorphism, Genetic; D051381:Rats