Orexin Receptor 2 (OX2R) (also known as hypocretin receptor 2) is one of two receptors that recognize the peptide neurotransmitters orexin A and orexin B. Orexin A and B are 33 and 28 amino acids in length, respectively, and are derived from a common precursor termed prepro-orexin.OX2R binds both orexin A and B with similar affinities while OX1R binds orexin A with greater affinity than orexin B (a one order of magnitude difference).
