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. 2021 Sep 27;9:744657. doi: 10.3389/fbioe.2021.744657

FIGURE 6.

FIGURE 6

Synthetic route for preparation (A) and mechanism of hypoxic reduction under the nitroreductase of the hypoxia-sensitive copolymer (B) (Thambi et al., 2016). Abbreviation: PEG, poly(ethylene glycol); PLys, poly(L-lysine); DIPEA, N,N-diisopropylethylamine.