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Cover Figure

ONLINE COVER This week features a Perspective that discusses the structural analysis of S1P1, a G protein–coupled receptor for sphinogosine 1-phosphate. The image shows the superposition of the crystal structures of 11 G protein–coupled receptors. [Image: Abby L. Parrill/The University of Memphis]

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