The corresponding author has formally requested to retract the above-titled paper, which was published online on 9 January 2009. Table 1 has been duplicated from a prior publication (Brain 2008;131:3311–3334). The immunoblot image in Fig. 4C has been fabricated, and portions of that image were duplicated from a prior Diabetes article (Diabetes 2008;57:1002–1017; Fig. 6A) without the knowledge of the corresponding author. The immunohistochemical images in Fig. 5 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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