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ONLINE COVER This week's issue features a Research Article describing experiments with an antibody that selectively recognizes μ-δ opioid receptor complexes. When analyzed in mice chronically exposed to morphine, the abundance of this particular receptor complex was increased in regions of the brain involved in the modulation of pain transmission. [Image: Chris Bickel, AAAS]

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Science Signaling. ISSN 1937-9145 (online), 1945-0877 (print). Pre-2008: Science's STKE. ISSN 1525-8882