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Effect of test materials on the viability of melan-a cells. Viability of melan-a cells treated with arbutin (A) and Oenothera laciniata methanol extract (B) (0~200 μg/mL) for 48 hr was analyzed using MTT assay. C: control, OLME: Oenothera laciniata methanol extract. Values are the mean ± SD of three independent experiments.
