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.
2
自然杀伤（NK）细胞是一种外周血淋巴细胞亚群。
Natural killer (NK) cells are a subset of peripheral blood lymphocytes.
3
实验发现来源于肿瘤组织的淋巴细胞群(TIL)对自体肿瘤无自然杀伤细胞活性或仅有低效细胞毒性。
The tumor-derived lymphocytes population (TIL) were of no natural killing activity or low cytotoxicity against the autologouS tumors.
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