the antagonism caused by this new analog was compared to that obtained with the substance p analog [ d-arg1 , d-pro2 , d-trp7,9 , leu11 ] substance p [ ( apttl ] sp ) , which has been used until now to characterize bombesin receptors on smooth muscle cells . psi 13,14-bn resulted to be more potent than [ apttl ] sp as antagonist of bombesin action on smooth muscle .
C1135918
smooth muscle cells
C1267092
smooth muscle