to document that the previously demonstrated excitatory effects of cholecystokinin-pancreozymin -- about 20 % purified and containing approximately 500 u/mg ( cck-pz 20 % ) -- on isolated guinea-pig antrum and fundus are caused by the hormone itself , and not by impurities , the effect of the synthetic c-terminal octapeptide ( op-cck ) was tested and compared with that of cck-pz 20 % .
C0008328
cholecystokinin-pancreozymin
C0037167
op-cck