Refers to any procedure that involves the transplantation, implantation, or infusion into a human recipient of either, (a) live cells, tissues, or organs from a nonhuman animal source, or (b) human body fluids, cells, tissues or organs that have had ex vivo contact with live nonhuman animal cells, tissues, or organs. Xenotransplantation products include live cells, tissues, or organs used in xenotransplantation.