Cell line authentication and BRAF/NRAS mutation detection were previously described (8 (link)-10 (link)). Cells were grown in RPMI media in 5% fetal bovine serum. PGC1α promoter reporter was obtained from Addgene. MITF and TRPM1 promoter reporters were obtained from R. Haq (6 (link)). Selumetinib (AZD6244/ARRY142886), AZD8055 and AZD2014 were from AstraZeneca, PLX4720 was from Plexxikon, and other inhibitors were from SelleckChem. For in vitro treatments, the inhibitors were dissolved in DMSO.