apart from the ( ca2+ + mg2+ ) -atpase of plasma membrane and mitochondrial atpase , the only other membrane atpase activities noted were ( na+ + k+ ) -atpase , which occurred in the same fractions as the ( ca2+ + mg2+ ) -atpase at rho = 1.10-1.13 and was of surprisingly low activity , and an atpase activity in light membrane fractions ( rho - 1.08-1.09 ) derived from zymogen granule membranes .
C0001473
atpase
C0001479
na