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Analgesic tone conferred by constitutively active mu opioid receptors in mice lacking β-arrestin 2

Hoa Lam, Matthew Maga, Amynah Pradhan, Christopher J Evans, Nigel T Maidment, Tim G Hales* and Wendy Walwyn

Molecular Pain 2011, 7:24  doi:10.1186/1744-8069-7-24