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(a) In vivo MR images from a mouse body after injection of MSNs-IONPs. (b) DOX drug release from MSNs-iron oxide pH-responsive carrier systems at different pH values. (c) In vivo MR images from a mouse body after injection of MSNs-DOX-IONPs. (a-c) Reprinted with permission from Wu et al. [204] Copyright (2014) Wiley-VCH 2014.
