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Cover Figure

ONLINE COVER This week features a Research Article describing how skin development requires reactive oxygen species generated by mitochondria in keratinocytes. The image shows developing hair follicles in mouse epidermis. [Image: Robert Hamanaka/The Feinberg School of Medicine, Northwestern University]

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