The corresponding author wishes to retract the above-listed article. Representative Western blots in Fig. 4K were previously published as independent experiments representing distinct experimental conditions in a 2009 Journal of Clinical Investigation article (Fig. 5D; Berglund et al., J Clin Invest 2009;119:2412–2422) and a 2010 American Journal of PhysiologyEndocrinology and Metabolism article (Fig. 6A; Berglund et al., Am J Physiol Endocrinol Metab 2010;299:E607–E614). The corresponding author contacted Diabetes to voluntarily report this inaccuracy and to request a retraction. He takes full responsibility for the error and apologizes to the journal, its readers, and the other authors.