VIP(6-28)(human, rat, porcine, bovine) is a potent antagonist that effectively counteracts the effects of exogenous vasoactive intestinal peptide (VIP) on cyclic adenosine monophosphate (cAMP) signaling.
PACAP-related peptide (PRP) is an endogenous 29-amino acid peptide that belongs to the secretin/glucagon superfamily of peptides, which includes secretin , glucagon , glucagon-like peptide-1 , GLP-2 , and pituitary adenylate cyclase-activating polypeptide . It is expressed in normal human pancreas and adrenal gland tissue and in some tumors that produce vasoactive intestinal peptide (VIP). PRP (1-29) is secreted by CHO-K1 cells that express human recombinant preproPACAP.