title: Hierarchies of epitope preference and the problem of Ir gene control.
mesh_terms: D000818:Animals; D000939:Epitopes / Q000235:genetics* / Q000276:immunology; D005802:Genes, MHC Class II; D009113:Muramidase / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*; D006377:T-Lymphocytes, Helper-Inducer / Q000276:immunology; D050378:T-Lymphocytes, Regulatory / Q000276:immunology; D001616:beta-Galactosidase / Q000276:immunology
chemical_list: D000939:Epitopes; D009113:Muramidase; D001616:beta-Galactosidase