intermediates formed in the presence of mg2+ alone ( mg-2+-atpase ) , mg-2+ and na+ ( ( na+ , k+ ) -atpase ) , and mg-2+ and ca-2+ ( ca-2+-atpase ) were separated by polyacrylamide gel electrophoresis in sodium dodecyl sulfate at ph 2.4 , indicating that these three atpases are different molecular species .
C0001479
na
C0001473
atpases