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Cover Figure

COVER This week features a Perspective about signals that specify axons and dendrites. The image shows that active Rit (a GTPase) is more abundant in the axon, where it contributes to the growth of this neuronal process. [Image: Christopher Bickel, AAAS]

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