among secretin analogs that were found to have low affinity for vasoactive intestinal peptide binding sites , [ 4-alanine , 5-valine ] secretin , that resembles vasoactive intestinal peptide at the first seven amino acids at the n-terminal end , was a partial agonist of vasoactive peptide at the first seven amino acids at the n-terminal end , was a partial agonist of vasoactive intestinal peptide and others failed to stimulate cyclic amp production .
C0001898
alanine
C0002520
amino acids