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a) NIR-responsive Dox release from T-DNA(Dox)-NR in vitro. Flow cytometry histogram profile of Dox fluorescence in KB cells upon different NIR irradiation time. b) In vitro cell viability measured by MTT assays. KB cells were incubated with ONT-NR, T-DNA-NR, and T-DNA(Dox)-NR for 2 h. Cells were then washed, exposed to NIR for 10 min, and incubated additionally 48 h prior to the cell viability measurement. *, P<0.05 by a two-sample student’s t-test.
