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Based on the above results it is anticipated that only a small amount of DOX would be released from the micelles in the systemic circulation (pH  7.4), reducing unwanted side-effects and heart cytotoxicity caused by the leakage of DOX. In contrast, faster release will occur once the micelles reach the tumor site, due to the lower pH environment (pH  5.8), and when internalized in tumor cells via receptor-mediated endocytosis in endosomes (pH  5.5¨C
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