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COVER This week's issue of Science Signaling complements the Science Special Issue on Organ Development. The development of plant leaves and the specialized structure called a root nodule are two of the topics highlighted in this issue. See the Editorial Guide for more details about this exciting issue. The image shows a seedling. [Image: Jupiter Images]

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