Galanin (GAL) is a neuropeptide widely distributed in the central and peripheral nervous systems. It consists of 29 or 30 amino acids and is involved in various physiological processes like regulating appetite, pain sensation, memory, and endocrine function.Besides,Galanin Like Peptide (GALP) has been identified as an interactor of GAL, thus a functional binding ELISA assay was conducted to detect the interaction of recombinant human GAL and recombinant rat GALP. Briefly, biotin-linked GAL were diluted serially in PBS, with 0.01% BSA (pH 7.4). Duplicate samples of 100μl were then transferred to GALP-coated microtiter wells and incubated for 1h at 37℃. Wells were washed with PBST 3 times and incubation with Streptavidin-HRP for 30min, then wells were aspirated and washed 5 times. With the addition of substrate solution, wells were incubated 15-25 minutes at 37℃. Finally, add 50μl stop solution to the wells and read at 450nm immediately. The binding activity of GAL and GALP was shown in Figure 1, the EC50?for this effect is 0.282 ug/mL.