the study deals with the interrelationship of the phosphate-transferring activities of the calcium-transporting sarcoplasmic reticulum membrane vesicles : the phosphate exchange between nucleoside triphosphate ( ntp ) and nucleoside diphosphate ( ndp ) ( ntp-ndp exchange ) , the calcium-dependent ntase , and the phosphorylation of ndp by inorganic phosphate in the presence of ntp ( ntp-pi exchange ) .
C0006711
phosphate
C0006675
calcium