2-(4-Hydroxyphenylazo)benzoicacid is a spectrophotometric probe that shows changes in absorption spectra upon binding to proteins and binds to bovine serum proteins.

Motilin, human, porcine is a gastrointestinal hormone, which is released during fasting and after eating, or by drinking water. Motilin, human, porcine promotes enteric cholinergic activity in human stomach with an EC50 of 33 nM, and thus modulates gastrointestinal motility function.

Pancreatic Polypeptide, rat is an agonist of NPY receptor, with high affinity at NPYR4. Pancreatic polypeptide (PP) is a 36-amino acid, C-terminally amidated peptide, and is a member of the PP-fold peptide family. It is produced and secreted by the PP cells of the islets of Langerhans.