Nature Communications 6: Article number: 6081 (2015); Published 20 January 2015; Updated 3 June 2015.

In Fig. 4c of this Article, the y axis values were wrongly given as 0, 20, 40, 60 and 80 in the middle and the lower panels. The correct values should read 0, 10, 20, 30 and 40 for the middle and 0, 1, 2, 3 and 4 for the lower panels. In addition, the y axis units of the lower panel were inadvertently changed from F/F0 to Hz/100 while the manuscript was being revised. The correct version of Fig. 4 appears below.

Figure 4