Correction to: Nature Biomedical Engineering https://doi.org/10.1038/s41551-020-00627-3, published online 12 October 2020.

In the version of this Article originally published, some of the figure citations were incorrect or mistakenly omitted from the text.

Fig. 2e,f should have been cited in addition to Supplementary Fig. 2 in the sentence beginning ‘Fluorescence-based biodistribution analysis...’.

Fig. 3d should have been cited at the end of the sentence beginning ‘We also found that...’.

Fig. 4a and Fig. 4b should have been cited in place of Supplementary Fig. 8a and Supplementary Fig. 8b, respectively, in the sentences beginning ‘The s.c. injection of SA–IL-4...’ and ‘Hence, Th17 cells in...’.

Fig. 4f should not have been cited in the sentence beginning ‘Treatment with SA–IL-4 reduced...‘; it should have been cited at the end of the sentence beginning ‘Treatment with FTY720 trended...’.

Fig. 4g,h should have been cited at the end of the sentence beginning ‘Wild-type IL-4 did not...’.

The citation to Fig. 4h should have been a citation to Fig. 4i in the sentence beginning ‘SA–IL-4 (s.c.) decreased the...’.

These errors have been corrected and the updated Article is available online.