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Cover Figure

COVER This week's issue features a Perspective on the secretion from antigen-presenting cells (APCs) of vesicles (exosomes) that contain immunostimulatory molecules. The image depicts an APC as it produces exosomes, some of which can stimulate a bystander T cell. [Image: Christopher Bickel, AAAS]

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