Transplants from identical twin donors are hard to reject, because all the genes are identical.
(Transplants from identical twin donors; are; hard to reject; because all the genes are identical) (Transplants from identical twin donors; to reject; ) (all the genes; are; identical)
Transplants from identical twin donors Transplants from identical twin donors all the genes
are to reject are
hard to reject because all the genes are identical
identical