the ca2+ -transport atpase [ ca2+ + mg2+ ) -atpase ) in a plasma membrane-rich fraction of porcine antrum ( stomach ) smooth muscle , is stimulated 2.9-times by calmodulin in the presence of 0.2 mg/ml saponin and reaches a value of 12.0 +/- 2.0 ( 4 ) mumol/100 mg protein ( equivalent to 110 g wet tissue ) per min at 37 degrees c and 10 ( -5 ) m [ ca2+ ] .
C0001476
ca2
C0001473
atpase