The hearts of genetically modified pigs could be transplanted into humans to solve the shortage of organ donors, scientists believe. Researchers successfully grafted a pig heart into a baboon more than a year ago and it is still functioning, they report today. Until now, organs transplanted into primates have only lasted for a maximum of six months before being rejected. But scientists have tweaked the DNA of pigs so that their hearts are more compatible with primates and humans. “The developments may instil a new ray of hope for thousands of patients waiting for human donor organs,” said Muhammad Mohiuddin of the Cardiothoracic Surgery Research Programme at the National Heart, Lung, and Blood Institute in the US. More