We know from research that laughter and joy boost immune functions, especially the production of the natural killer cells that help protect the body from illness and cancer.

研究表明笑声和快乐会提高你的身体免疫力，特别是它们会产生的自然杀伤细胞能使你免受疾病和癌症的侵害。

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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)。

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The genes in question control a type of white blood cell known as natural killer cells, or NK cells.

斯坦福大学的研究者们提出的这项假设发人深思，甚至出人意料。 他们所说的基因控制了一种被称为自然杀手细胞(NK细胞）的白血球细胞。

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So, the classes of T-cells: macrophages, natural killer cells, these are a class of cells that's particularly important called dendritic cells.

这类T淋巴细胞包括巨噬细胞,自然杀伤细胞等 统称为树突细胞,树突细胞尤为重要

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Two specific types of immune system cell that attack invaders - CD4 T-cells and natural killer cells - increased in number with age, with a higher rate of increase in women than in men.

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Natural killer cells normally play an important role in inducing apoptosis of cancerous cells and others that have been infected with viruses.

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