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. Author manuscript; available in PMC: 2020 Apr 1.
Published in final edited form as: Expert Opin Drug Deliv. 2019 Apr 22;16(4):415–439. doi: 10.1080/17425247.2019.1598375

Figure 5.

Figure 5

Schematic representation of internal or endogenous stimuli to the pathological microenvironments (pH, redox, enzymes and small molecules) and external or exogenous (magnetic field, light, temperature and ultrasounds) stimuli that can be used to trigger on demand drug release from MSNs.