That's not the point the previous poster was making. The point I believe they were trying to make is that in many to most cases of chimerism, the immune problem would not occur. In some ways, it has many similarities to organ transplants - with a "matching" donor, which is most likely with close relatives, the immune system will not recognize the part as foreign and will not reject it. In chimerism, the other part will naturally be that of a sibling or twin, greatly reducing the likelihood that it will not be a match and will be identified as foreign tissue vs a normal part of the body. However, as in the case of the woman in question, that is not 100%.Originally Posted by Godzilla78
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