Passage: Isotype ko class canzawa ne mai ilimin halitta tsari da ya auku bayan kunnawa da B cell, wanda damar da cell don samar da daban-daban azuzuwan antibody (IgA, IgE, ko IgG). daban-daban azuzuwan antibody, kuma ta haka ne effector ayyuka, an ayyana ta da m (C) yankuna na immunoglobulin nauyi sarkar. Da farko, naïve B Kwayoyin bayyana kawai cell-surface IgM da IgD tare da m antigen dauri yankuna. Kowane isotype aka saba da wani daban-daban aiki; Saboda haka, bayan kunnawa, an antibody da wani IgG, IgA, ko IgE effector aiki na iya zama da ake bukata don yadda ya kamata kawar da wani antigen. Class canzawa damar daban-daban 'ya'ya cells daga wannan aiki B cell don samar da daban-daban antibodies. Sai kawai yankin na m antibody canje-canje a lokacin kowane nauyi antibody sauya yankunan, da kuma sabili da effector ayyuka, an ayyana ta da m (C) yankuna na immunoglobulin nauyi sarkar.
abubuwan da aka kiyaye nucleotide