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Cover Figure

ONLINE COVER This week features a Research Article indicating that the ability of phosphoinositides to produce functionally diverse effects on the actin cytoskeleton, such as actin comets versus membrane ruffles, may depend on the relative concentrations of different species. The image shows an astronomical comet. [Image: Exactostock/SuperStock]

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