MLVs are a kind of retrovirus known to cause cancer in mice.

VOA: special.2011.01.18

So if it's not a cell that's going through division you can't use a retrovirus to express the protein.

如果细胞不在分裂阶段,你就不能用逆转录病毒来表达某个蛋白

耶鲁公开课 - 生物医学工程探索课程节选

You know about retroviruses, the most famous and important one at this time is HIV, which is a retrovirus.

你们应该听过逆转录病毒吧,现下最为知名而重要的 HIV,就是一种逆转录病毒

耶鲁公开课 - 生物医学工程探索课程节选