in the choroid plexus , the ouabain-sensitive electron-dense reaction products of na+ , k+-atpase ( p-nppase ) were strongly positive in the microvilli and along the inner surface of microvilli , without showing any mg2+-atpase and ac activities , and all three enzymatic activities were positive along the basal plasmalemmas and negative along the lateral and apical ( not including microvilli ) plasmalemmas .
C0001473
atpase
C0001477
mg2