Nature Reviews Immunology (2018) https://doi.org/10.1038/s41577-018-0067-6 Published online 11 September 2018

In the 5th paragraph of the originally published version of this Highlight article, it was incorrectly stated that AMPK is activated by “a high ATP to AMP ratio”; this has now been corrected to “a high AMP to ATP ratio” in the HTML and PDF versions.