应用组织学方法比较观察了猪繁殖与呼吸综合征病毒（PRRSV）弱毒细胞疫苗与灭活疫苗生殖道黏膜免疫的效果。

The effect of mucosal immune of porcine reproductive and respiratory syndrome virus (PRRSV) attenuated and disactived vaccine was investigated by histological method.

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研究者们正在越来越多的想治疗早期老年痴呆症的最佳时间，在大脑中形成毒蛋白质杀死更多的脑细胞之前。

Researchers increasingly think the best time to treat Alzheimer's is in the earliest stages, before the toxic proteins that form in the brain kill too many brain cells.

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蔡让他们有一个毒蛋白，破坏脑细胞。

Tsai gives them a toxic protein that destroys brain cells.

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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

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Helper cells don't become cytotoxic cells but they help B cells become antigen producing - antibody producing cells.

附助细胞不会成为细胞毒细胞,它们帮助B细胞成为抗体分泌细胞

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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

耶鲁公开课 - 生物医学工程探索课程节选