Dr Muhammad M Mohiuddin spent years as a xenotransplantation expert trying to figure out how to make a pig's heart survive in a human body.
Doctors at US hospital remove heart-lung machine connected to support David Bennett's new heart, four days after first surgery of its kind.
Surgeons successfully transplant a heart from a genetically modified pig in a human patient, a first of its kind procedure, says University of Maryland Medical School.
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