Several errors in figures have been corrected.
1. Figure 4, panel C: One amino acid was incorrectly labeled and has now been corrected (from L798 to L792).
2. Figure 5, panel D: One amino acid was incorrectly labeled and has now been corrected (from L746 to L747).
3. Figure 5, panel D: The L861 amino acid label position was adjusted to better match its structural position in the figure.
The incorrect versions of both figures have been replaced with the correct versions.
The corrected online version is at http://stm.sciencemag.org/content/5/216/216ra177.full, and the corrected PDF version of the article is at http://stm.sciencemag.org/content/5/216/216ra177.full.pdf.
- Copyright © 2014, American Association for the Advancement of Science
