Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Passage: Kowace sarkar mai nauyi tana da yankuna biyu, yankin da ba ya canzawa da kuma yankin mai canzawa. Yankin da ba a canzawa ba iri ɗaya ne a cikin dukkan ƙwayoyin cuta na isotype ɗaya, amma ya bambanta a cikin ƙwayoyin cuta na isotypes daban-daban. Sarƙoƙi masu nauyi γ, α da δ suna da yanki na yau da kullun wanda ya ƙunshi yankuna Ig guda uku (a cikin layi), da kuma yankin hinge don ƙarin sassauci; sarƙoƙi masu nauyi μ da ε suna da yanki na yau da kullun wanda ya ƙunshi yankuna immunoglobulin huɗu. Yankin da ke canzawa na sarkar mai nauyi ya bambanta a cikin kwayoyin cutar da kwayoyin B daban-daban ke samarwa, amma iri ɗaya ne ga duk kwayoyin cutar da kwayar B ɗaya ko kwayar kwayar B ke samarwa. Yankin canji na kowane sarkar mai nauyi yana da kusan amino acid 110 kuma ya ƙunshi yanki ɗaya na Ig.  Tambaya: Amino acid nawa ne suke cikin sarkar mai nauyi?
110 da kuma