title: Phylogenetic tracing of Ia genes.
mesh_terms: D000818:Animals; D002645:Chickens; D003429:Cross Reactions; D000949:Histocompatibility Antigens Class II / Q000235:genetics*; D007518:Isoantibodies / Q000235:genetics; D007519:Isoantigens / Q000235:genetics; D008214:Lymphocytes / Q000276:immunology; D010802:Phylogeny; D011892:Rana catesbeiana; D013045:Species Specificity
chemical_list: D000949:Histocompatibility Antigens Class II; D007518:Isoantibodies; D007519:Isoantigens