The antibodies they make are all specific to the antigen that stimulated them.

它们制造的抗体,对激活它们的抗原来说都是特异性的

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They only kill cells that have the signal which stimulated them.

只能杀死那些带有能激活,它们的标记信号的细胞

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Because at the end of the Y, there's a special region of the antibody, the antigen-binding region, that is highly tuned for binding to the antigen that stimulated them.

因为Y形抗体的末端,是抗体上非常特殊的一个区域,即抗原结合区域,这一区域高度特异性地,用于结合激活免疫的抗原

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They might have different ligands which stimulate them, but once they're stimulated they work the same way.

尽管激活它们的配体有所不同,但一旦被激活的话,接下来的机制就一样了

耶鲁公开课 - 生物医学工程探索课程节选