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a The antitumor mechanism of the multifunctional peptide in the tumor microenvironment. b Transmission electron microscopy images of nanoparticles under different pH conditions with or without recombinant human MMP-2 (rhMMP-2). Scale bars: 100 nm. c Treatment efficacy of peptide nanoparticles and the quantity of CD8+ T cells measured in melanoma-bearing mice. Copyright (2018), American Chemical Society.
