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Orexin‐A and orexin‐B, also named hypocretin‐1 and hypocretin‐2, are two hypothalamic neuropeptides highly conserved across mammalian species. Their effects are mediated by two distinct G protein‐coupled receptors, namely orexin receptor type 1 (OX1‐R) and type 2 (OX2‐R), which share 64% amino acid identity. Given the wide expression of OX‐Rs in different central nervous system and peripheral areas...