The kidney came from a pig that was genetically edited to remove harmful pig genes and add certain human genes to improve its compatibility with humans. The world’s first patient with a transplanted pig kidney has died, almost two months after the operation.In March, Massachusetts General Hospital transplanted the genetically-edited pig kidney into Rick Slayman, a 62-year-old man living with end-stage kidney disease. The operation was a milestone in xenotransplantation – the transplantation of organs or tissues from one species to another – as a potential solution to the worldwide organ shorta…