Kalli nassi da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe iri ɗaya kamar nassi: Nassi: Kowane sarkar mai nauyi tana da yankuna biyu, yankin da ba a canzawa da kuma yankin da ba a canzawa ba. Yankin da ba a canzawa ba daidai yake a cikin dukkanin kwayoyin cutar iri ɗaya, amma ya bambanta a cikin kwayoyin cutar iri daban-daban. Sarƙoƙi masu nauyi γ, α da δ suna da yanki mai ɗorewa wanda ya ƙunshi yankuna uku na Ig (a layi ɗaya), da kuma yankin jingina don ƙarin sassauci; sarƙoƙi masu nauyi μ da ε suna da yanki mai ɗorewa wanda ya ƙunshi yankuna huɗu na immunoglobulin. Yankin da ke canzawa na sarkar mai nauyi ya bambanta a cikin kwayoyin cutar da ƙwayoyin B daban-daban ke samarwa, amma iri ɗaya ne ga duk ƙwayoyin cutar da ƙwayoyin sel B ko ƙwayoyin sel B ke samarwa. Yankin da ke canzawa na kowane sarkar mai nauyi yana da kusan amino acid 110 kuma ya ƙunshi yanki ɗaya na Ig. Tambaya: Yaya yawancin sarƙan tandems, y, s da s masu
uku