Nociceptin/orphanin FQ (N/OFQ) is the endogenous ligand of the opioid receptor-like 1 receptor (NOP), the G-protein coupled receptor which shows overall 60% homology with the classical opioid receptors.

• 孤啡肽(Nociceptin/Orphanin FQ,N/OFQ)是阿片受体样受体(Nociceptin/orphanin FQ receptor,NOP receptor)的内源性配基。