Correction to: Nature Structural & Molecular Biology https://doi.org/10.1038/s41594-019-0221-2, published online 22 April 2019.

In the version of this article initially published, the Acknowledgements section was missing. The Acknowledgements are as follows: “Y.F. is supported by the National Institute of Aging of the US National Institutes of Health (NIH) through grant R01AG05605. S.H. acknowledges support of that NIH grant R01AG05605 and the Tau Consortium of the Rainwater Charitable Foundation.” The error has been corrected in the HTML and PDF versions of the article.