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    Rights: © Copyright. 2011. University of Waikato. All Rights Reserved. Published 7 December 2011 Size: 26 KB Referencing Hub media

    Diseased, damaged and failing human organs, cells and tissues can be replaced with healthy alternatives. Transplants usually come from human donors (allotransplantation), but researchers are investigating whether animal donors can also be used (xenotransplantation).