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PM2.5 exposure inhibits cell migration in human melanocytes. (A) PIG1 or (B) PIG3V cells were exposed to (0-200 µg/ml) PM2.5 for 24 h, then cell migration was examined by transwell assay (magnification, x400). Data are presented as the mean ± SD. n=6. *P<0.05, **P<0.01 vs. 0 µg/ml PM2.5. PM2.5, particulate matter 2.5.
