We talked about attenuating in the laboratory, using cell culture techniques and what we know about mutating viruses.
我们讲过实验室中,利用细胞培养技术培养减毒疫苗,以及我们所了解的减毒病毒
Here's where the intelligence of the immune system comes in, is that these cytotoxic T-cells that are generated only kill cells that have this signal on it.
免疫系统的聪明之处就在此,这些细胞毒T细胞,只能杀死具有特殊标记信号的细胞
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