The immune system--morphology and function.
D000937:Antigen-Antibody Reactions; D001402:B-Lymphocytes / Q000276:immunology / Q000502:physiology; D006801:Humans; D007111:Immunity, Cellular; D007125:Immunogenetics; D013601:T-Lymphocytes / Q000276:immunology / Q000502:physiology