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Cover Figure

ONLINE COVER This week's issue features a Research Article that describes a role for phospholipase D1 in platelet aggregation. The image is a scanning electron micrograph of activated platelets. [Credit: Image copyright Dennis Kunkel Microscopy, Inc.]

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