in human transplants. this report from our medical editor fergus walsh contains pictures of the operation. this is the gene edited pig heart, ready for transplant into a human. the organ looks perfect, a good size, and the extraction of the organ went routinely. surgeons in maryland spent eight hours performing the world first. scientists had spent decades building to this moment, which some believe could revolutionise transplantation. the recipient was david bennett, seen here with his son and daughter. he was dying of heart failure and too ill to be considered for a human organ. now his new pig heart is working well. it s an absolute miracle. it provides a lot of hope for my family, my dad and many others. he is doing extremely well. his vitals look great, using the pig heart alone. and here is david