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The T2* weighted MR imaging of in vitro samples. Group 1 contained 15% agarose gel only. In groups 2–6, 1 µL/mL of lipofectamine and 15% agarose gel were used for transfection of DPSCs and then 180, 90, 70, 50, and 30 µg/mL of iron oxide were applied for cell labeling, respectively. Group 7 was non-coated iron oxide nanoparticles and group 8 consisted of just H2O.
