He aha te pātai ki: "Ko ia pito o te "Y" o te antibody kei roto i te paratope (he hanganga rite ki te raka) e motuhake ana mo tetahi epitope motuhake (he rite tonu ki te ki) i runga i te antigen, e taea ai e enei hanganga e rua te herea tahi me te tika"? Ko te kaupapa ko te antibody.
"me pēhea te whakamahi i ngā ārai mate i roto i?"