The FEBS Journal. 278():366, JUN 2011 Issn Print: Model.IssnPrint Publication Date: 2011/06/01 Print Mechanism of constitutive activity in G protein-coupled opioid receptors: P21.49 V. Vezzi;R. Guerrini;T. Costa; + Author Information 1Dept. of Biochemistry, ‘Sapienza’ University of Rome, Italy, 2Dept. Pharmacology, ISS, Rome, Italy, 3Dept. Pharm. Biotech. Sci., University of Ferrara, Italy Checking for direct PDF access through Ovid Abstract Abstract unavailable for this article.