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Measurement of cell viability. (A) NIRF signals of cells treated with MNPs (Column 1-3 and 10-12) and IRDy800CW-MNPs (Column 4-9) at doses of 0, 20, 30, 40, 50, 60, 80 and 100 μg/ml (From row 1-8) for 24 h. (B) NIRF signals of cells (A) after washing three times with PBS. (C) Quantitative measurement of cell viability by MTT assay. The error bars represent mean and standard deviations of experiments performed with 6 repeats.
