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In tumor tissues, the peptide Glycine\u2010 Phenylalanine\u2010 Leucine\u2010 Glycine (GFLG) is recognized and sheared by overexpressed cathepsin B, which stripped the outer layer of methoxy polyethylene glycol (mPEG) and made it more readily available for uptake by tumor cells. After entering the tumor cells, the bonded DOX and the physically encapsulated DOX in the micelles played a synergistic role, realizing the killing of tumor cells, thus effectively enhancing the therapeutic effect on tumors. 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