Correction to: Nature Chemical Biology https://doi.org/10.1038/s41589-018-0145-x, published online 16 October 2018.

In the version of this paper originally published, the structure for epinephrine shown in Figure 1a was redrawn with an extra carbon. The structure has been replaced in the HTML and PDF versions of the article. The original and corrected versions of the structure are shown below.

figure 1

Original and Corrected.