The application notes include recommended starting dilutions; optimal dilutions/concentrations should be determined by the end user.
Exendin 4 is a 39 amino acid peptide found in venom from the Gila monster Helicoderma suspectum. It is a member of the glucagon secretin family of peptide hormones and neuropeptides. Exendin 4 is a potent agonist of the GLP1 receptor and hence a potent stimulator of insulin secretion.
Anti-Exendin 4 antibody  (ab26263) 使用論文
has not yet been referenced specifically in any publications.