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Cover Figure

ONLINE COVER This week features a Research Article showing that the production of functional spermatozoa depends on regulation of the Ca2+ concentration in epididymal fluid. The image shows epithelial cells in a section of the mouse epididymis. [Image: Ulrich Kriebs, Universität des Saarlandes, Germany]

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