title: Shaking the evolutionary tree.
mesh_terms: D000818:Animals; D000831:Animals, Newborn / Q000276:immunology; D005075:Biological Evolution; D005802:Genes, MHC Class II; D007108:Immune Tolerance; D007111:Immunity, Cellular; D007121:Immunocompetence; D007125:Immunogenetics; D051379:Mice