in the presence of inhibitors for mitochondrial h+-atpase , ( na+ + k+ ) - and ca2+-atpases , and alkaline phosphatase , sealed brush-border membrane vesicles hydrolyse externally added atp demonstrating the existence of atpases at the outside of the membrane ( `` '' ecto-atpases '' '' ) .
C0001476
ca2
C0001473
atpases