title: WHO Expert Committee on Biological Standardization. Twentieth report.
mesh_terms: D000900:Anti-Bacterial Agents / Q000592:standards*; D001688:Biological Products / Q000592:standards*; D006454:Hemoglobins / Q000592:standards; D007106:Immune Sera / Q000592:standards; D014373:Tuberculin / Q000592:standards; D014612:Vaccines / Q000592:standards; D014944:World Health Organization
chemical_list: D000900:Anti-Bacterial Agents; D001688:Biological Products; D006454:Hemoglobins; D007106:Immune Sera; D014373:Tuberculin; D014612:Vaccines