Nociceptin and the ORL‐1 ligand [Phe<sup>1</sup>ψ (CH<sub>2</sub>‐NH)Gly<sup>2</sup>]nociceptin(1‐13)NH<sub>2</sub> exert anti‐opioid effects in the Freund's adjuvant‐induced arthritic rat model of chronic painRosalia Bertorelli, Ennio Ongini, Kamran Rafiq et al.|British Journal of Pharmacology|1999Cited by 59