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Cover Figure

COVER This week features a Protocol on tracking the movement of cells grown on quantum dots. The image depicts a non-fluorescent cell trail. [Image: Carolyn A. Larabell, UCSF and Lawrence Berkeley National Laboratory]

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