Nature Communications 6: Article number: 6168 10.1038/ncomms7168 (2015); Published: February032015; Updated: April172015
The original version of the Supplementary Information for this Article contained errors in the labelling in Supplementary Figs 12 and 14, which rendered them illegible and caused an image in Supplementary Fig. 14 to become obscured. The HTML has now been updated to include a correct version of the Supplementary Information. In addition, the legends for the Supplementary Movies were originally omitted from the HTML and have now been added. The PDF version of the Article was correct from the time of publication.