There are fewer debates on animal sources, as historically laboratory animals have been used to develop organ transplantation technologies for prolonging human life, such as using animal organs in xenotransplantation on human.
对于器官源是动物的场合争议较少，因为历史上实验动物被用来发展器官移植技术以延长人类的寿命，例如在人身上进行异种器官移植。