The cells of one species transplanted to another species.
Websites:
Biology Dictionary
Definition:
Surgically grafting tissue from one species onto an organism of a different species. See also xenotransplantation.
Websites:
Glossary
Definition:
Tissue or organs from an individual of one species transplanted into or grafted onto an organism of another species, genus, or family. A common example is the use of pig heart valves in humans.