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Release profile of DOX from MSNs-DOX (A), MSNs-DOX@PDA (B), and MSNs-DOX@PDA-PEG-APt (C). The release experiment was performed in PBS at pH 7.4 and 5.5 in sequence.
Abbreviations: MSNs, mesoporous silica nanoparticles; PDA, hydrochloride dopamine; PEG, polyethylene glycol; APt, aptamer; DOX, doxorubicin; PBS, phosphate-buffered saline.
