Xenotransplantation The number of people in need of hearts, livers, kidneys, lungs, pancreases, and transplanted cells are in the thousands. The supply of human organs and tissues is and always will be insufficient to satisfy the great needs. Scientists looked in xenotransplantation, the transplanting of tissues and organs from animals to humans, as a possible answer to the dilemma. Organs from pigs, goats, lambs, and monkeys were all tried and rejected by the recipient human. The human body rejects forgein tissue. The rejection process destroys the capillaries in the newly transplanted organ, causing it to hemorrhage massively. Scientists are currently working with a hype