title: Human and mouse specific T-cell helper factors assayed in vivo and in vitro: implications for human Ir genes.
mesh_terms: D000818:Animals; D000941:Antigens; D005802:Genes, MHC Class II; D006801:Humans; D008211:Lymphocyte Cooperation; D051379:Mice; D010455:Peptides / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000941:Antigens; D010455:Peptides