islet cell plasma membranes contain a calcium-stimulated and magnesium-dependent atpase ( ca2+ + mg2+ ) -atpase ) which requires calmodulin for maximum enzyme activity ( kotagal , n. , patke , c. , landt , m. , mcdonald , j. , colca , j. , lacy , p. , and mcdaniel , m. ( 1982 ) febs lett . 137 , 249-252 ) .
C0001477
magnesium
C0001473
atpase