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Cover Figure

COVER This week features a Teaching Resource on heterotrimeric guanine nucleotide-binding protein (G protein)-coupled receptors (GPCRs). The image shows a GPCR with the topology of receptors in the glucagon-like receptor family.

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