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。

Moderate but not exaggerated exercise increase the activity of the white blood cells, particularly the natural killer cell activity.

适量的运动可以增强白细胞尤其是自然杀伤细胞的活动度，并且可以加强呼吸系统的免疫力。

At the end of the trial period, the researchers found no changes in natural killer cell activity except in the group taking fish oil.

在试验末期，除了服用鱼油的组，研究人员没有发现自然杀伤细胞活性有变化。

The immune modulatory effect of the Caulerpa racemosa var peltata polysaccharides on T lymphocyte subgroup and Natural killer cell in mice;

以上事实表明，总状蕨藻多糖具有较强的抗肿瘤和增强小鼠免疫力的作用。

A. Meyer(G. S. )are reported. In vivo, G. S. significantly enhances anti-sheep red cell-specific plaque-forming cell response and the activity of natural killer cell in mouse.

活体中，人参明显提高小鼠脾抗绵羊红细胞性溶血空斑形成反应和自然杀伤细胞活性。