To produce these animals, researchers inject fertilized mice eggs with foreign genes, and then place them in the uterus of a female mouse.

VOA: special.2009.06.23

This concept of introducing foreign genes, genes that are made of recombinant DNA into animals using this kind of technique is widely used in biomedical research.

这种通过基因重组,来向动物体内导入外源基因的方法,广泛应用于,各种生物医药的研究中

耶鲁公开课 - 生物医学工程探索课程节选