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I heard this recently but because I'm so busy with other stuff, I can't reference it. It seems that cells of the embryo can migrate into the mother's brain and differentiate there into maternal brain cells.

This shows that embryonic cells when separated from source tissue can continue their differentiation elsewhere--even in tissue from a different individual. It is able to do this because embryonic and maternal RF's were the same. If this effect was demonstrated in non-inbred individuals then it shows that RF expression is a random process and, occasionally, the maternal and embryonic RF's are the same.
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