Understanding modern immunology: II. The anatomy and functions of the immune system (Second of two parts).
D000937:Antigen-Antibody Reactions; D006801:Humans; D008198:Lymph Nodes / Q000033:anatomy & histology / Q000276:immunology / Q000502:physiology; D008208:Lymphatic System / Q000276:immunology*; D008214:Lymphocytes / Q000276:immunology*; D013154:Spleen / Q000276:immunology; D013950:Thymus Gland / Q000276:immunology