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Cover Figure

ONLINE COVER During the month of July, Science Signaling published a series of articles on the topic of lymphocyte regulation. The series culminates this week in a Focus Issue that highlights research and commentary on the mechanisms by which T cells, B cells, and natural killer cells are regulated so that they mount an effective immune response without causing damage to the host. The image shows a collection of immune cells as they circulate through the blood. [Image: Dennis Kunkel Microscopy, Inc.]

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