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Hyperthermia treatment experiment on the 4T1 cells with (A) Fe3O4 and (B) Fe3O4:0.1%Y NPs in 35 μg/mL and 100 μg/mL concentrations. The MTT assay was performed directly after applying the magnetic field for 30 min. The applied magnetic field was 20 mT with the frequency of 423 kHz. The temperature of the environment was 37 °C.
