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(A) Schematic illustration of the synthesis of MBA-PDA-PEG-PNiPMA polymer and the fabrication of MBA-Pc 4-TRN nanogels, (B) the relationship between TRN crosslinking density and its transition temperature. The transition temperatures were determined by measuring the change of transmittance for TRN PBS suspension at the nanogel concentration of 0.16 mg/ml during the increase of temperature.
