histochemical localization by mg2+ capture methods of k+-dependent , ouabain-sensitive phosphatase activity in the pig placenta shows that strong na+ , k+-dependent adenosine triphosphatase ( na+ , k+-atpase ) activity is restricted to the basal zone of the columnar epithelium covering the areolar chorionic villi .
C0032043
placenta
C0008508
chorionic