2023. In September 2021, mankind realized the first successful porcine kidney allotransplantation, which rewrote the history of human organ transplantation and succeeded in making a pioneering and exploratory key step for xenotransplantation. The pig's body shape, organ size and organ characteristics are similar to those of human beings, and putting them into the body will not overcrowd the other space, and it was found through kidney biopsy and blood tests that, after the implantation of porcine kidneys into human bodies, the With standard immunosuppressant treatment, no acute rejection reaction occurred in the subjects, so the team decided to carry out a clinical study of pig kidney implantation in humans in 2023.