微嵌合体是由于某一个体的少量细胞转移到另一个体内所造成的。多见于怀孕妇女及器官移植受体中。男性胎儿怀孕期间留在母亲体内的DNA，会终其一生一直留在女性大脑之中。研究发现女性大脑中的男性DNA会减少老年痴呆症的风险。也就是说，儿子通过其DNA帮助母亲避免患上神经性疾病。
但是科学家们并不是确切知道微嵌合体到底有多普遍。
But scientists do not know exactly how common microchimerism is.
IL 2逆转实验、微嵌合体检测表明，该耐受与克隆失活、微嵌合体的存在有关。
The IL2 reverse test and detection of microchimerism showed that the tolerance mechanism involved anergy, and was related to formation of microchimerism.
微嵌合体经常在自体免疫性疾病(autoimmune conditions)中被检测到。这就导致了一种暗示：母血细胞(maternal cells)可能会引发那些疾病。
It is detected more often in people with autoimmune conditions, which has led to the suggestion that the maternal cells could trigger those diseases.
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