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Cell viability was determined by MTT assay and was expressed as a mean value ± standard deviation of three separate experiments.
Notes: n=3, exposure times: 5 seconds, 15 seconds, 30 seconds, and 45 seconds. P<0.05.
Abbreviations: MTT, 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide; s, seconds.
