The corresponding author has formally requested to retract the above-titled paper, which was published online on 26 November 2007. The immunoblot image in Fig. 6A has been fabricated, and portions of that image were duplicated in a later Diabetes article (Diabetes 2009;58:934–945; Fig. 4C) without the recognition of this error by the corresponding author. The immunohistochemical images in Figs. 5 and 7 were not from the cohorts of mice indicated, but were taken from older data not representative of the cohorts studied. The author apologizes to the readers of the journal for any inconvenience these issues may have caused.

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