thus the absence of occluding junctions , which could act as effective permeability barriers , in both epithelial components of the fetal membranes suggests that the factors able to influence the amniotic fluid turnover or the paraplacental protein exchange are the geometrical relationships and physico-chemical properties of the intercellular channels in the amniotic epithelium and chorionic trophoblast .
C0242358
occluding junctions
C0014609
epithelium