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How do genetic chimeras with different blood types not die?

If a person is a chimera and has two different blood types in his veins, how does he not die? Shouldn't the immune system attack one of the blood types? In 1953 a human chimera was reported in the ...
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When do chimeras happen?

If one developing twin absorbs another, when does that happen? Is it possible for an appendage or organ to develop and be the only remaining vestige of an absorbed twin, such as a hand or a mouth, or ...