VOLUME 285 (2010) PAGES 12629–12637
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Fig. 2C was prepared from different sections of the same gel and autoradiogram, but the border between the different sections was not clearly indicated. The revised Fig. 2C now includes a line defining this border. This error does not change the interpretation of the results or the conclusions of this work.
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An inadvertent error occurred during the compilation of images for the top panel of Fig. 3E. This error has now been corrected. This error does not change the interpretation of the results or the conclusions of this work.
