this separation and that of the membranes , led to the conclusion that the ( na+ + k+ ) -dependent atpase is localized principally in the plasma membrane of all cells whatever their state of maturation , while 5'-nucleotidase is predominantly located in the basal-lateral membrane of the villous cells and may serve as a specific marker for the purification of this membrane .
C0007603
plasma membrane
C0007634
cells