in the present study we examined the effect of gastrin , the cooh-terminal octapeptide of cck ( cck-8 ) , and the tetrapeptide of cck ( cg-4 ) on contraction of dispersed gastric smooth muscle cells from guinea pig and tested the ability of various cck receptor antagonists to affect agonist-induced muscle cell contraction .
C0017151
gastrin
C0039659
tetrapeptide