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Cell viability in the cell cultures treated with nanorods studied by SRB assay on HSkMEC cells. Bars present 540 nm absorbance in the assay reflecting the amount of cell material in the cultures treated with gradient concentrations of LaPO4:Tb3+ 10 % or LaPO4:Tb3+ 10 %@SiO2 or LaPO4:Tb3+ 10 %@SiO2@NH2. Control cell cultures were supplemented with adequate volume of PBS. Groups of wells that significantly differ from the control wells (by ANOVA) were marked with asterisks
