The antibody has a proven strong Biotin-Streptavidin/HRP staining at a 1/8000-1/10,000 dilution in rat amygdala, cortex, and suprachiasmatic nucleus.

The specificity of the antiserum was examined by soluble pre-adsorption with the peptides in question at a final concentration of 10-5 M. VIP immunolabeling was completely abolished by pre-adsorption with VIP. Pre-adsorption with the following peptides resulted in no reduction of immunostaining: Secretin, gastric inhibitory polypeptide, somatostatin, glucagon, insulin, ACTH, gastrin 34, FMRF-amide, rat GHRF, human GHRF, peptide histidine isoleucine 27, rat pancreatic polypeptide, motilin, peptide YY, substance P, neuropeptide Y, and CGRP.

The histochemical antibody for VIP is generated in a rabbit against porcine VIP conjugated to bovine thyroglobulin with carbodiimide. The antibody is provided as 100 µL of lyophilized whole serum, and 0.09% sodium azide.