UBC and melanoma: Skin window chamber tumor-bearing animals were injected with B16F10 melanoma cells: either a B16F10 cell line that stably expressed an ubiquitin promoter-driven click beetle green (CBG, λem = ~540 nm in vivo) reporter or a B16F10 tumor cell line that stably expressed a CMV promoter-driven firefly luciferase (FLuc, λem = ~600 nm in vivo) reporter.