Correction to: Nature Communications https://doi.org/10.1038/s41467-019-11719-3, published online 28 August 2019.

This Article contained an error in Fig. 1. In figure 1g, the PD-1 antigen, green oval, was incorrectly shown binding to a-msTfR instead of a-PD1. This error has now been corrected in the HTML and PDF versions of the article.