Those animals that you produce are called transgenic animals because they're expressing, usually at high levels, a transgene or a gene that's not normally present in their species.

那么这些小鼠就称为转基因动物,因为转基因动物,通常能高效地,表达转基因,即一个通常不存在于该物种的基因

耶鲁公开课 - 生物医学工程探索课程节选