Correction to: Nature Chemical Biology, published online 9 March 2020.

In the version of this News and Views originally published, the figure title incorrectly stated ‘drug transporter’ and the first sentence of the legend was ambiguous. The first sentence of the legend for Fig. 1 should state “Real biomembranes in cells have protein:phospholipid ratios (by mass) that are well in excess of one, and this minimizes any bilayer transport of small molecules” and the title should read “Solute carriers are required for drug transport across cellular membranes.” The errors have been corrected in the HTML and PDF versions of the paper.