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Cover Figure

ONLINE COVER This week features a Research Article that shows that the guanine nucleotide exchange factor cytohesin-1 is required for efficient myelin production by Schwann cells. The image shows an electron micrograph of a cross section of sciatic nerves from 7-day-old cytohesin-1 knockout mice. [Image: Noriko Nemoto, Kitasato University School of Medicine, Sagamihara, Japan, and Junji Yamauchi, National Research Institute for Child Health and Development, Setagaya, Japan]

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