Correction to: Nature Nanotechnology https://doi.org/10.1038/s41565-019-0600-1, published online 6 January 2020.

In the version of this Letter originally published, in Fig. 2d, the molar ratio values of cholesterol for formulations C-1 to C-7 were mistakenly given as ‘50’, but they should have been ‘40’. This has been updated in the online versions of the Letter.