title: Antigen recognition and signaling in the immune system.
mesh_terms: D000818:Animals; D000917:Antibody Formation; D000937:Antigen-Antibody Reactions; D000941:Antigens; D001402:B-Lymphocytes / Q000276:immunology*; D001665:Binding Sites; D006636:Histamine Release; D007111:Immunity, Cellular; D008285:Major Histocompatibility Complex; D008407:Mast Cells / Q000276:immunology*; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000941:Antigens