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Cover Figure

ONLINE COVER This week features two Research Articles about astrocytes, one that describes how astrocytes may modulate synaptic activity by changing the local concentration of extracellular K+ and another that identifies an mGluR5-selective diffusion barrier that enriches mGluR5 in astrocytic processes. The image shows a cortical human astrocyte labeled so as to outline the fine perisynaptic processes. [Image: Nancy Ann Oberheim and Takahiro Takano, University of Rochester Medical School]

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