Scientists at the University of North Carolina found out that in the placenta in women who have an autoimmune disorder (preeclampsia), there is an excess number of genes that are responsible for the regulation of the immune system. Preeclampsia is responsible for 15% of preterm birth and it happens in 10% of cases of pregnancy. In this disorder, the placenta is perceived by the mother’s body as an alien object.
The body has sialic acid, which covers all the cells of our body and allows the immune system to determine the "enemy" and "his". When this process fails, the body begins to attack itself.