Surgeon Muhammad Mansoor Mohiuddin is a leader in the novel field of xenotransplantation—transferring organs from one species to another—in his case, from pigs to humans.

To ensure the viability of the pig heart, it is kept cold and perfused ... Even after you genetically modify an object, the recipient's immune system can still act adverse towards it.

Pig heart valves have been used as replacements ... One of the added human genes causes the pigs to produce an immune system-moderating protein called CD46. More people need a kidney than any ...