“…When they grow up on the dishes, 100 ppm of melanin treated on 0, 6, 12, 24, and 48 hours. Each dish was tested toxicity by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay [ 8 ]. The colorimetric MTT metabolic activity assay is applied to determine whether melanin is able to kill cells.…”