Nature Communications 6: Article number: 8029 (2015); Published 20 August 2015; Updated 7 February 2017

Professors SonBinh T. Nguyen and Jiaxing Huang were inadvertently omitted from the list of corresponding authors in this Article. The correct information for correspondence is: ‘Correspondence and requests for materials should be addressed to H.D.E. espinosa@northwestern.edu) or to J.H. jiaxing-huang@northwestern.edu) or to S.T.N. stn@northwestern.edu).