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(a) Cell viability of the MG63 cells treated with nHAPMn5 at different concentrations under an 808 nm laser (1 W/cm2) (*P<0.05, **P<0.01, ***P<0.001) and (b) corresponding fluorescence images of the MG63 cells stained with Calcein-AM and PI. Scale bar = 50 μm.
