β-Endorphin acts as an agonist that binds to various types of G protein–coupled receptors(GPCRs), most notably to the mu, delta, and kappa opioid receptors. The receptors are responsible for supra-spinal analgesia.
Beta-Endorphin
Somatostatin
Gluten exorphin
Dynorphin
N-Acetylserotonin
Neuropil
Histrelin
Delta-sleep-inducing peptide