At 3 a.m. the team started thawing the kidney, a process that took two hours. At 9 a.m., Dr. Alban Longchamp and Dr. Tatsuo Kawai, transplant surgeons at Mass General, opened the pig’s abdomen ...

At this advanced stage, patients either receive a kidney transplant or remain on dialysis — an expensive and often debilitating treatment — for the rest of their lives. Of the more than 90,000 ...