the present histochemical results revealed high levels of activity of alkaline phosphatase ( alpase ) , potassium-dependent nitrophenylphosphatase ( k+-p-nppase ) and carbonic-anhydrase isozymes ( ca-i and ca-ii ) in the apical region of the flask cells , indicating that enzyme zonation may be the main site of the ion pumping .
C0022173
isozymes
C0014442
enzyme