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Why will tissue from identical twin be rejected in some cases?

From Medline Plus : Also, transplants from one identical twin to another are almost never rejected. My question : Why can a tissue from an identical twin be rejected ?
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Anti-antibodies for preventing transplant rejection

Transplanted organs from the donor are attacked by antibodies from the recepient. So can't we construct anti-antibodies and destroy specifically those antibodies which are causing the rejections ? ...
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How do transplanted stem cells find their way to bone marrow?

Miraculously, transplanted stem cells find their way to the bone marrow missing the stem cells. How do they achieve this?
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1answer
50 views

Adaptability in immune system

I read somewhere that recently some people are trying to use harmless bacteria that live symbiotically in humans to express some portions of antigens of the harmful ones. Some people have raised ...