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. 2020 Dec 21;11:601497. doi: 10.3389/fimmu.2020.601497

Figure 2.

Figure 2

Strategies of nanoparticles to increase tissue oxygen content. Oxygen carriers wrap O2 in vitro, or bind O2 in high oxygen areas in vivo and release them in low oxygen environment. Nanoparticles with catalytic effects react with excessive endogenous H2O2 in the TME to generate oxygen.