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(A) schematic illustration of the plausible swelling mechanism of the produced DOX-SPIO/NPCS microparticle, and (B) pH-dependent of statistical results of volume change of NPCS gel droplets measured at different time-point. The volume changing ration can be seen as an index for evaluating the swelling degree of NPCS. **p < 0.01, and ***p < 0.001, respectively.
