in ouabain-sensitive ( na+ + k+ ) -atpases such as the brain , guinea pig kidney , and rabbit kidney enzymes , ouabain stimulated the mg2+-dependent phosphorylation at lower concentrations , while a higher concentration was required for the stimulation of rat kidney ( na+ + k+ ) -atpase , an ouabain-insensitive enzyme .
C0006104
brain
C0086045
concentration