One identical twin can donate an organ to the other without fear of it being rejected because their human lymphocyte antigens match.

Question

Quizplus · Accepted Answer

Identical twins share the same genetic material, including human lymphocyte antigens, which means that organ donation from one twin to the other has a very high chance of success as the body won't recognize the transplanted organ as foreign and reject it.

One Identical Twin Can Donate an Organ to the Other