Exam 3 Review:  Chapter 21:  Types of Immunity

autograft - A tissue or organ grafted into a new position in or on the body of the same individual; the most desirable source for skin grafting in burns, if possible, because no rejection will occur.

isograft - A graft of tissue which is obtained from a donor genetically identical to the recipient for which no rejection will occur; only identical siblings (twins, triplets, etc.) can provide such tissue, a desirable source for transplantation, because no rejection will occur..

allograft = homograft - A graft of tissue which is obtained from a donor of the same species as, but with a different genetic make-up from, the recipient, as a tissue transplant between two humans (relatives or not); rejection of the tissue is likely unless immunosuppressive therapy is provided to the recipient. 

xenograft = heterograft - A graft of tissue which is obtained from a donor of a different species from the recipient, e.g., when animal skin is used as a temporary transplant in cases of severe burns, or when pig heart valves are transplanted into humans; rapid rejection of the tissue is very likely unless potent immunosuppressive therapy is provided to the recipient. 

1.