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On page 3380, Figure 1E contains a duplicated tubulin panel. The wrong tubulin panel was inserted in the figure. Because it has proved impossible to find the original data and blots, the authors have performed the same experiment described in the article, using new immunoblots. The new data are consistent with the previous findings and provide evidence for the reproducibility of the research. The new data are in a supplemental file, available in the online version of this erratum, that contains a new copy of Figure 1E. The authors apologize for the error and state that this correction does not affect the original conclusions of the study.