Mice and rats are commonly used to test new medicines.

VOA: special.2009.05.05

so recording from the brains of mice and rats

就是观察记录实验鼠大脑的反应。

成功的医学研究 - SpeakingMax英语口语达人

"When the research progresses to a stage when the information coming from mice and rats is not sufficient, we may move up to using monkeys.

VOA: standard.2010.02.16