solubilization of microsomal proteins followed by calmodulin affinity chromatography resulted in the separation of two distinct ca2+-mg2+-atpases ( ca2+-regulated mg2+-dependent atpases ) , one being insensitive to calmodulin ( atpase-1 ) , the other being stimulated about 5-fold by calmodulin ( atpase-2 ) .
C0001477
ca2
C0001473
atpase