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Representative images of Fontana–Masson stained B16F10 cells. Cells were pretreated with (A) vehicle, (B) forskolin 20 μM, (C) forskolin 20 μM and GMC 25 μg/mL, and (D) forskolin 20 μM and GMR 25 μg/mL for 4 days. Images were captured at ×100 magnification under a microscope.
