There was an error in Fig. 4. The plot in panel E was duplicated in panel F. The correct plot for panel F has now been inserted. The corrected online version of the article is at http://stm.sciencemag.org/content/4/132/132ra55.full, and the corrected PDF version of the article is at http://stm.sciencemag.org/content/4/132/132ra55.full.pdf.
10.1126/scitranslmed.3004739
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