You could see, for example, when it's expressed in a cancer cell, and where it's expressed.

你可以看到，比如说，它什么时候在癌细胞里被表达，在哪里被表达。

麻省理工公开课 - 化学原理课程节选

Maybe it got mutated and its making the wrong kinds of proteins; cancer cells often do that.

它可能已经变异,产生了错误的蛋白,癌细胞往往就是这样

耶鲁公开课 - 生物医学工程探索课程节选

One way that that's done is by introducing genes into cancer cells, genes that aren't normally expressed in any mammalian cell, but that will cause the cancer cell to die.

已经成功应用的一种方法是,将基因导入癌细胞,而这种基因通常不在哺乳动物细胞中表达,但是可以导致癌细胞的死亡

耶鲁公开课 - 生物医学工程探索课程节选

You can see that it would be problem here if the gene that you were trying to give to the cancer cells also went to normal cells-- that would be a problem.

这确实是个问题,如果我们想导入癌细胞的自杀基因,也能进入正常细胞,那问题就大了

耶鲁公开课 - 生物医学工程探索课程节选