THE GENETIC ENGINEERING BEHIND PIG-TO-HUMAN TRANSPLANTS

A new paper describes a transplant of pig kidneys into a brain-dead recipient. The transplant was meant to parallel, to the greatest extent possible, a standard human kidney transplant. The donor pig came from a facility where all animals are regularly screened for viral infections. A number of human genes were added to the pig genome to reduce the likelihood that the human immune system will recognize the pig's tissue as foreign.
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