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(a) 4,5-dimethylthiazol-2,5-diphenyltetrazolium bromide (MTT) and (b) sulforhodamine B (SRB) cell viability of f-MSNs and 5-FU-loaded MSNs administered at various concentrations (20, 50, and 100 μg/mL) in HEK293 cells. Data is represented as mean ± SD (n = 3). * p < 0.05 was considered statistically significant.
