Nature Communications 6: Article number: 6745 (2015); Published 13 April 2015; Updated 18 June 2015.

The immunofluorescence images in Fig. 1b of the PDF version of this Article were inadvertently duplicated from Fig. 1a during the production process. The correct version of Fig. 1 appears below; the HTML version of the paper was correct from the time of publication.

Figure 1
figure 1

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