Surgeons at Massachusetts General Hospital have removed a genetically engineered pig kidney from a 67-year-old New Hampshire man after a period of decreasing kidney function, the hospital confirmed to WIRED in a statement. The organ functioned for nearly nine months, longer than previous pig organ transplants, before it was removed on October 23.

Tim Andrews received the pig kidney on January 25 after being on dialysis for more than two years due to end-stage kidney disease. His rare blood type meant that he faced a much longer wait time for a human donor kidney than most patients, who already wait on average three to five years for a kidney.

The shortage of human donors has pushed scientists to look to animals as a potential source of organs. Kidneys are the most in demand, with n

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