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ONLINE COVER This week's issue features a Research Article that describes how apoptotic endothelial cells at atherosclerotic plaques release microvesicles that contain a microRNA that modulates the signaling of neighboring cells. This causes the release of a factor that attracts progenitor cells that help to limit the size of the plaque in mouse models of atherosclerosis. The image shows a collar-induced plaque in the carotid artery of a mouse. [Image: Alma Zernecke, Kiril Bidzhekov, Stefanie Wilbertz, and Christian Weber, Institute of Molecular Cardiovascular Research, RWTH Aachen University, Aachen, Germany]

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