these results provide further support for our previous conclusion ( shigekawa , m. , dougherty , j.p. and katz , a.m. ( 1978 ) j.biol . chem . 253 , 1442 -- 1450 ) that 2 classes of atp site exist in the calcium pump atpase in the absence of added alkali metal salts , one being the catalytic site and the other being the regulation site which activates the activity of the catalytic site .
C0001476
calcium pump
C0001473
atpase