Correction to: Nature https://doi.org/10.1038/s41586-024-07583-x Published online 26 June 2024

The authors have been informed that in the version of this article initially published, the term “haem” was used incorrectly in connection with the pigment haemocyanin. Text has been clarified in the third paragraph of the “O2 establishes PPO2 in cellulo crystals” section, in the second paragraph of the “Phase transition of PPO2 and oxygenation” section and in the Extended Data Fig. 5c legend. The changes are made in the HTML and PDF versions of the article.