Fig. 5 in Guaianolide sesquiterpene lactones from Achillea millefolium L

Fig. 5. The effects of compounds 6, 7, 10, and 8-MOP on the melanin content (A) and compounds 6, 7 and 10, and 8-MOP on tyrosinase activity (B) of B16 melanoma cells at the concentrations of 1, 10, 50 μM. Each value represents the mean ± SE (n = 3). *P <0.05, **P <0.01, ***P <0.001.