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Cover Figure

COVER This week features a Book Review of "An Introduction to Systems Biology" by Uri Alon. The image represents favored (dark) feed forward loops in the transcriptional networks of yeast and E. coli over a background of unfavored loops. [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