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Indocyanine green (ICG) nanoparticles were developed via electrostatic interactions of ICG and dextran based block copolymers (PEG-dextran(-SS-NH2)) as near-infrared (NIR) theranostic nanoparticles. The nanoparticles could be activated from "OFF" to "ON" of NIR fluorescence in an intracellular environment and used for NIR imaging and photothermal therapy.
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Liu et al. (2013) studied this question.
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