还有一种学说，认为自然杀伤性淋巴细胞（natural killer lymphocyte）即NK细胞和K细胞在形态结构和表面标记均相同，是同一种细胞，但免疫作用形式不相同。有待进一步研究。
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Natural killer cells, which are a class of lymphocyte distinct from t cells and B cells, destroy foreign cells (eg, neoplastic cells) even without prior sensitization.
自然杀伤细胞是一类与T细胞和B细胞不同的淋巴细胞，可在未被致敏的情况下破坏外来细胞(如肿瘤细胞)。
Objective:To investigate the effects of inhalation anesthetic on T lymphocyte subsets and natural killer(NK) cell activity.
目的：观察异氟醚和安氟醚吸入麻醉对病人T细胞亚群、自然杀伤细胞（NK细胞）的影响。
Objective To study the effects of serum and decidual tissue fluid in early pregnant women on natural killer cells (NK cells) activity and lymphocyte proliferation.
目的 探讨早孕妇女血清及蜕膜组织液对自然杀伤（NK）细胞及淋巴细胞功能的影响。
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