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Sci. STKE, 6 November 2001
[DOI: 10.1126/stke.2001.107.re16]


The corresponding author's email address was incorrect in the online display of the review by Matthew P. Pando and Paolo Sassone-Corsi.

The corresponding author is Paolo Sassone-Corsi. E-mail: paolosc{at}

The online display was corrected January 22, 2002.

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