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Cytotoxicity of violacein against normal human cell line (Foreskin normal fibroblast) conducted by MTT (3-(4, 5-dimethyl thiazol-2-yl)-2, 5- diphenyl tetrazolium bromide) assay. All measurements were taken in replicates of three, and results are expressed as arithmetic mean ± standard error of the mean. (A) Bar diagram of the result at different concentration and (B) representative confocal microscopic image of cells.
