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Cell viability of 4T1 cells treated by OVA-PEG-MnFe2O4NPs at different concentrations without (a) or with laser irradiation (b, ***p< 0.001, vs. PBS control). (c) Fluorescence images of cells treated with PBS, PBS plus laser irradiation, or OVA-PEG-MnFe2O4NPs ([MnFe2O4] = 400 μg/mL) plus laser irradiation (green fluorescence related to live cells, and red fluorescence related to dead cells).
