According to the most recent guidelines of the European Union, a xenotransplant is defined as any procedure that involves:
• the transplantation, implantation or infusion to a human recipient of organs, tissues or viable cells of animal origin
(type A xenotransplant) or
• the ex vivo contact of human body fluids, cells, tissues or organs with live cells, tissues or organs of animal origin
(type B xenotransplant).
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