title: Understanding modern immunology: I. The development of the human immune system. (First of two parts).
mesh_terms: D000906:Antibodies / Q000502:physiology; D000937:Antigen-Antibody Reactions; D000941:Antigens / Q000502:physiology; D001402:B-Lymphocytes / Q000276:immunology; D005260:Female; D005865:Gestational Age; D006801:Humans; D007109:Immunity; D007111:Immunity, Cellular; D007070:Immunoglobulin A / Q000502:physiology; D007136:Immunoglobulins / Q000502:physiology; D007231:Infant, Newborn; D008264:Macrophages / Q000276:immunology; D008297:Male; D011247:Pregnancy; D013601:T-Lymphocytes / Q000276:immunology; D013950:Thymus Gland / Q000276:immunology
chemical_list: D000906:Antibodies; D000941:Antigens; D007070:Immunoglobulin A; D007136:Immunoglobulins