Nat. Med. 17, 573–580 (2011); published online 17 April 2011; corrected after print 4 August 2011; corrected after print 5 April 2012

In the version of this article initially published, the image of the actin bands shown in Supplementary Figure 2b was mistakenly rotated 180 degrees. The image has been replaced with the bands in their correct orientation, and the densitometry shown for this blot has been recalculated, which does not affect the conclusions. The figure legends for Figure 1e and Supplementary Figure 2b have also been edited to indicate that the same kidney samples were used for the blots in Figure 1b,e and Supplementary Figure 2b and that the actin bands shown for these blots are identical.