<prompt> Ngaphandle kwamathumba, yini enye engacekela phansi ingqamuzana? Njengoba kunikezwe umbuzo odlule, bhala umongo onempendulo yawo. Kungaba imisho engu-1 kuya kwengu-20. Umongo:  <response>: Amangqamuzana ombulali wemvelo, noma ama-NK cells, ayingxenye yesimiso somzimba sokuzivikela ezifweni esingawahlaseli ngokuqondile amagciwane ahlaselayo. Kunalokho, amangqamuzana e-NK abhubhisa amangqamuzana aphazamisekile, njengamangqamuzana omdlavuza noma amangqamuzana anegciwane, ngokubona amangqamuzana anjalo ngesimo esaziwa ngokuthi ukuziphuthelwa. Leli gama lichaza amangqamuzana anezinga eliphansi le-cell-surface marker ebizwa ngokuthi i-MHC I major histocompatibility complex isimo esingavela ekungenweni amagciwane amangqamuzana aphethe. La magciwane abizwa ngokuthi ababulali bemvelo ngenxa yokuthi ekuqaleni kwakucatshangwa ukuthi awadingi ukuvuselelwa ukuze abulale amangqamuzana angenawo amandla okuzibulala. Kwaphela iminyaka eminingi kungacaci ukuthi amangqamuzana e-NK awahlukanisa kanjani amangqamuzana anomdlavuza namangqamuzana anegciwane. Manje sekuyaziwa ukuthi ukwakheka kwe-MHC ebusweni balawo mangqamuzana kuyashintsha futhi amangqamuzana e-NK ayasebenza ngokubona umuntu olahlekile. Amangqamuzana omzimba avamile awabonwa futhi awahlaselwa amangqamuzana e-NK ngoba aveza ama-antigen e-MHC angonakalisiwe. Lawo ma-antigen e-MHC aqashelwa ama-killer cell immunoglobulin receptors KIR abeka amabhuleki emangqamuzaneni e-NK. 