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Schematic illustration of STP-decorated, doxorubicin-loaded liposomes in response to pH changes for targeting the tumor microenvironment. Confocal micrographs of HUVEC cells with stained nuclei (blue) and doxorubicin (red) treated with (a) STP-LS-DOX at pH 7.4, (b) LS-DOX at pH 5.8, and (c) STP-LS-DOX at pH 5.8. Adapted with permission from Han et al., ACS Appl. Mater. Interfaces 8(29), 18658–18663 (2016). Copyright 2016 American Chemical Society.
