Fig. 2
From: Inhibition of melanogenesis by Gaillardia aristata flower extract
Cell viability (a) and melanin content (b) in human epidermal melanocytes incubated with the indicated concentration of GAE (5, 10, 20 μg/mL). Kojic acid are used as positive controls. Data are mean ± standard deviation. **p < 0.01 compared with the vehicle-treated group (n = 5)