When I studied Anatomy and Physiology in college, the lesson that included microchimerism, became instructive to me on a different level. Learning that every child leaves within his mother a microscopic bit of himself–and that it remains within her forever–the dogma of the Immaculate Conception instantly became both crystal clear and brilliant to me.
Actually, microchimerism also relates to the dogma of the Assumption of Mary as well. In the psalms we read “you will not suffer your beloved to undergo corruption.” Christ’s divine body did not undergo corruption. It follows that his mother’s body, which contained a cellular component of the Divinity–and a particle of God is God, entire–would not be allowed to corrupt as well.
That's unscientific. The scientific explanation for the Assumption and the Immaculate Conception is midichlorians, not microchimerism. Just like the bond between Shmi Skywalker and Anakin Skywalker.