Fig. 2. Effect of PM10 on the cell viability of follicular cells. MTT assay was performed in cultured primary human dermal papilla (DP), dermal sheath (DS), dermal fibroblast (DF), and outer root sheath (ORS) cells. After 24 hours of serum starvation, cells were treated with suspended PM10 solution at the indicated concentrations for 24 hours. Data are presented as the mean±standard deviation from three independent experiments using cells from three individuals. ^*p<0.05 compared with the control by Student's t-test. PM: particulate matter.