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Sci. STKE, 22 October 2002
[DOI: 10.1126/scisignal.1552002pe44]

Erratum:

The text of the figure from the Perspective by A. Ventura and P. Pelicci was unreadable. A new figure has been created. The online display has been corrected and a corrected PDF is available starting October 29, 2002.

The original, uncorrected PDF can be accessed from http://stke.sciencemag.org/cgi/data/sigtrans;2002/155/pe44/DC1/1.

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