Now in this case the host - you want the host not only to replicate all the DNA, you want it also to express the gene.

而这种情况下宿主--,你不只希望宿主复制基因,同时也想使之表达基因

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In this case here, you're generating host cells, cytotoxic T-cells, that can kill only very specific cells, cells that are expressing this foreign antigen.

而在这个例子中,人产生宿主细胞,即细胞毒性T细胞,它只会消灭特定的细胞,也就是携带特定异己抗原的细胞

耶鲁公开课 - 生物医学工程探索课程节选