NEUROPEPTIDE CANDIDATE. “The ADCYAP1 gene encodes the pituitary adenylate cyclase-activating polypeptide (PACAP), which is one of the most studied neuropeptides (more than 3000 papers deal directly with PACAP). The peptide and its receptors are widely distributed in the brain and in various peripheral organs.”
http://rspb.royalsocietypublishing.org/content/early/2011/02/11/rspb.2010.2567