B cell na-achọpụta pathogens mgbe antibodies na elu ya jikọtara ya na antigen pụrụ iche. Nke a bụ antigen / antibody complex nke B cell na-ewe site na proteolysis n'ime peptides. B cell na-egosipụta ndị a antigenic peptides na elu ya MHC klas II ụmụ irighiri ihe. Ngwakọta nke MHC na antigen na-adọta onye na-enyere aka T cell, nke na-ewepụta lymphokines ma na-arụ ọrụ B cell. Ka mkpụrụ ndụ B ahụ na-arụ ọrụ na-amalite ịkekọrịta, ụmụ ya (plasma cells) na-ewepụta ọtụtụ nde nke mkpụrụ ndụ nke na-amata antigen a. Ndị a na-agbasa na ọbara na lymph plasma, na-ejikọta pathogens na-egosipụta antigen ma na-egosi ha site na mbibi ma ọ bụ na-arụ ọrụ maka mbibi na mbibi site na phagocytes. Antibodies nwekwara ike ịmegide nsogbu site na ijikọta nje virus ozugbo, site na ijikọta nje bacteria ma ọ bụ na-egbochi nje. Ajụjụ: Gịnị ka nje bacteria na-
nsí nje bacteria