Correction to: Nature Methods https://doi.org/10.1038/nmeth.3689, published online 14 December 2015.

In the version of the article initially published, in Fig. 2b, the two images in column III (0 min and 17 min) were identical due to an error in figure preparation. The original data have been located, and the corrected image is presented as Fig. 1, below.

Fig. 1
figure 1

Corrected Fig. 2b.