Holy ... uh ... Moly, I never heard of this before. The Anchoress, who originally posted this at Patheos where the original post link no longer works, sez:
When studying Anatomy and Physiology in college, the lesson that briefly discussed fetomaternal 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.I believed it anyway, but that made sense on several levels. Incredible.
Mary, then, was indeed a tabernacle within which the Divinity did reside — not for a limited time, but for all of her life. Understanding this (and considering how the churches seemed to get it ‘way before microscopes told us anything) the Immaculate Conception made and makes perfect sense: God, who is All-Good is also completely Pure; the vessel in which He resides, then, must be pure, too, or it would not be able to sustain all of that “light in which we see light itself.”
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 become corrupt, either.