"Here we start to see perhaps the most sinister complication of pregnancy: preeclampsia, a mysterious condition characterised by high blood pressure and protein discharge in the urine. Preeclampsia is responsible for around 12 per cent of human maternal deaths worldwide. But it’s very much just the start of our problems."
This is a very well-written discussion of the maternal-fetal conflict theory that underpins preeclampsia research.
http://aeon.co/magazine/nature-and-cosm ... -and-baby/