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Cover Figure

ONLINE COVER This week features a Perspective that describes how desensitization of a receptor for sphingosine 1-phosphate enables lymphocytes to leave the vascular compartment. The image shows T cells recirculating through lymph nodes. [Image: Yana Hammond/Science Signaling]

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