adenylate cyclase activity employing 5'-adenylyl-imiodiphosphate ( amp-p ( nh ) p ) as substrate was found to be associated with the dense tubular system ( smooth endoplasmic reticulum ) in intact fixed platelets , and was apparent only when the cells were incubated with prostaglandin e1 .
C0230789
smooth endoplasmic reticulum
C0007634
cells