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. 2021 May 13;6:70. doi: 10.1038/s41541-021-00330-7

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© This is a U.S. Government work and not under copyright protection in the US; foreign copyright protection may apply 2021, corrected publication 2021

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Fig. 1 — Gray circles represent nanoparticles while, green circular indented units represent antigens. Abbreviations PLA, PLGA, and PEG correspond to polylactic acid, polylactic-co-glycolic acid, and polyethylene glycol, respectively. Modified and adapted from Zhao et al.².