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ONLINE COVER This week's issue features a Perspective describing how ammonia released from cells acts as a paracrine and autocrine signal to control autophagy. This work was published in a Research Article by Eng et al. in the 27 April 2010 issue. The image depicts an artist's rendition of a cell releasing ammonia. [Image: Chris Bickel, AAAS]

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