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Cover Figure

COVER This week features a Perspective on the exchange of membrane proteins between cells. The image shows T cells internalizing MHC I from antigen-presenting cells. [Image: Jonathan Sprent, The Scripps Research Institute and reprinted with permission from Science, copyright 1999 AAAS]

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Science Signaling. ISSN 1937-9145 (pre-2008: Science's STKE. ISSN 1525-8882)