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This work reports a hypoxia‐activated fluorescent probe for tumor imaging by using self‐immolative block copolymer with azobenzene linkage. The water‐soluble polymer composed of self‐immolative building blocks shows no obvious fluorescence. Under the hypoxic microenvironment of tumor cells, the azobenzene is reduced by the overexpressed azoreductase, which will trigger a domino‐like disassembly of...
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