Researchers implanted a genetically modified pig liver into a human and demonstrated that the xenograft could perform core hepatic functions for an extended period before surgical removal was required. The procedure showed the organ produced bile and supported coagulation and metabolic activity, offering proof-of-concept that pig organs can bridge critically ill patients. The patient later died from complications unrelated to initial graft function, underscoring both the potential and the clinical complexity of xenotransplantation. The case was presented as a milestone for organ replacement research and raises questions about immunologic control and perioperative management.