Antigen recognition.
D000818:Animals; D017951:Antigen Presentation / Q000276:immunology; D000941:Antigens / Q000276:immunology*; D006649:Histocompatibility Antigens / Q000276:immunology; D006801:Humans; D011946:Receptors, Antigen / Q000276:immunology
D000941:Antigens; D006649:Histocompatibility Antigens; D011946:Receptors, Antigen