whereas the nonhydrolyzable guanosine triphosphate analogue , 5'-guanylyl-imidodiphosphate , was a potent inhibitor of cck binding , it had no effect on binding of this secretagogue , suggesting that a novel cascade not involving a guanine nucleotide-binding protein mediates cck stimulation of pancreatic secretion .
C0018353
guanosine triphosphate
C0018366
guanylyl-imidodiphosphate