There is a bidirectional flow of fetal and maternal cells in pregnancy. Fetal cells migrate and resides in breast tissue, thyroid tissue, skin and so on in mothers body. How can we detect these fetal cells in mothers tissue?
If it is a male fetus, then you just look for the Y-chromosome. Else, you need to do a DNA analysis.
W
if it is a male child look for genes that are on the Y chromosome.
This is called microchimerism, sometimes -if sustained until few months postpartum- detectable by the immune system leading to autoimmune disease.
Detection methods include -beside Y chromosome as said above- HLA typing.
https://onlinelibrary.wiley.com/doi/full/10.1046/j.1537-2995.2001.41010039.x?sid=nlm%3Apubmed
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