Figure 4

Melanin content analysis. (A) Color of cell lysates dissolved in NaOH, control, arbutin-treated, and PAM-treated cells. Changes in melanin contents depending on the treatment conditions and incubation times; i.e., (B) 24 and (C) 48 h. Changes in (D) tyrosinase, (E) TRP-1, and (F) TRP-2 depending on the treatment conditions.