VOLUME 288 (2013) PAGES 18811–18824
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Lanes 3–6 of the original Western blot image in Fig. 3C contained the same bands as lanes 3–6 of the Western blot image in Fig. 3D, and both panels failed to indicate that separate lanes from the original blots had been spliced together. The correct Western blot image for Fig. 3C is now provided, and lines have been added to indicate the area where the blot images were joined. These changes do not affect the interpretation or conclusions of this work.