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In this photo provided by eGenesis, a genetically modified pig liver is removed in Massachusetts for transportation to the University of Pennsylvania in Philadelphia in December 2023. On Thursday, Jan. 18, 2024, the university announced surgeons externally attached the pig liver to a brain-dead human body and watched it successfully filter blood, a step toward eventually trying the technique in patients with liver failure. (eGenesis via AP)

In this photo provided by eGenesis, a genetically modified pig liver is removed in Massachusetts for transportation to the University of Pennsylvania in Philadelphia in December 2023. On Thursday, Jan. 18, 2024, the university announced surgeons externally attached the pig liver to a brain-dead human body and watched it successfully filter blood, a step toward eventually trying the technique in patients with liver failure. (eGenesis via AP)

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