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)。

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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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Pfizer's drug tremelimumab and Bristol-Myers Squibb's ipilimumab are antibodies to a protein called CTLA-4 (cytotoxic T-lymphocyte antigen-4) that acts as an emergency brake to prevent killer T cells from attacking healthy tissue.

FORBES: Targeting Melanoma