RT Journal Article SR Electronic T1 Morphine desensitization, internalization and down-regulation of the mu opioid receptor is facilitated by serotonin 5-HT2A receptor co-activation JF Molecular Pharmacology JO Mol Pharmacol FD American Society for Pharmacology and Experimental Therapeutics DO 10.1124/mol.108.048272 A1 Juan F. Lopez-Gimenez A1 M. Teresa Vilaro A1 Graeme Milligan YR 2008 UL http://molpharm.aspetjournals.org/content/early/2008/08/14/mol.108.048272.abstract AB