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In page Jim Guy Tucker:

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Beginning during his college years at Harvard, Tucker suffered from an auto-immune disease, later diagnosed as primary sclerosing cholangitis. It created severe liver problems which seriously debilitated him and threatened his life (he had nearly died from gastro-intestinal bleeding in 1994, and had steadily worsened since). On Christmas Day 1996, Tucker received a liver transplant at the Mayo Clinic in Rochester, Minnesota.