Key points from article :
Surgeons successfully transplanted a genetically modified pig kidney into a living human patient with end-stage kidney disease.
The pig was genetically engineered to be more compatible with the human immune system.
The pig's genes were altered to reduce the risk of rejection by the recipient's body.
The surgery lasted 4 hours and involved a team at Massachusetts General Hospital.
The recipient is recovering well with no signs of rejection. He was previously on dialysis and now has a functioning kidney, allowing him to stop dialysis treatment.
