Ban da ciwon daji, menene zai iya lalata kwayar halitta"? Bisa ga tambayar da ta gabata, ka rubuta mahallin da ke ɗauke da amsar. Zai iya zama jumla 1 - 20. Abubuwan da ke ciki:
Kwayoyin kashewa na halitta, ko NK cells, wani bangare ne na tsarin garkuwar jiki wanda ba ya kai hari kai tsaye ga ƙwayoyin cuta masu shigowa. Maimakon haka, ƙwayoyin NK suna hallaka ƙwayoyin da suka kamu da cutar, kamar ƙwayoyin ciwon daji ko ƙwayoyin da ƙwayoyin cuta suka kamu da su, suna gane irin waɗannan ƙwayoyin ta hanyar yanayin da aka sani da "rashin kai". Wannan kalmar tana bayyana ƙwayoyin cuta tare da ƙananan matakan alamar ƙwayoyin cuta da ake kira MHC I (babban ƙwayar cuta) <unk> yanayin da zai iya tashi a cikin cututtukan ƙwayoyin cuta na ƙwayoyin cuta. An kira su "mai kisan kai na halitta" saboda ra'ayin farko cewa ba sa bukatar kunnawa domin su kashe ƙwayoyin da suke "rashin kai". Shekaru da yawa ba a bayyana yadda kwayoyin NK ke gane ƙwayoyin tumo da ƙwayoyin cuta ba. Yanzu an san cewa an canza kayan MHC a saman waɗancan ƙwayoyin kuma ƙwayoyin NK sun kunna ta hanyar gane "rashin kai". Kwayoyin jiki na al'ada ba a gane su ba kuma ba a kai hari ga kwayoyin NK ba saboda suna bayyana cikakkun antigens na MHC. Waɗannan antigens na MHC ana gane su ta hanyar masu karɓar ƙwayoyin ƙwayoyin ƙwayoyin ƙwayoyin ƙwayoyin ƙwayoyin ƙwayoyin ƙwayoyin ƙwayoyin ƙwayoyin ƙwayoyin ƙwayoyin ƙwayoyin ƙwayoyin ƙwayoyin ƙwayoyin ƙwayoyin ƙwayoyin ƙwayoyin ƙwayoyin ƙwayoyin ƙwayoyin ƙwayoyin ƙwayoyin ƙwayoyin ƙwayoyin ƙwayoyin ƙwayoyin cuta.