Your Fetus Is an Alien

Another theory comes from Koji Yoshinaga, the program director of the reproductive sciences branch of the National Institute of Child Health and Human Development. Yoshinaga has been studying, among other things, BIEFs, or blastocyst implantation essential factors?the factors that impact the interaction between embryo and uterus. He believes?as he writes in a scientific paper in the Journal of Reproduction and Development?that these factors signal to the mother that her body must provide nutrients without attacking. As he sees it, pregnancy is a huge balancing act between the mother?s body revving up certain systems to nourish the baby and stanching other systems that could hurt the baby. It?s a complex dance between hormones and the immune system. For instance, Yoshinaga says that prolactin?the hormone that stimulates milk production?also revs up T-cell production. But progesterone, another key pregnancy hormone, triggers something called PIFB, pregnancy-induced binding factor, which seems to protect the embryo from those revved up cells. Still, we really don?t know precisely how progesterone does the trick.

Source: http://feeds.slate.com/click.phdo?i=c75ed994691bad9524590e9221ecb901

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