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Gene expression in the hepatic stellate cells of interleukin-1β (IL-1β), interleukin-6 (IL6), tumor necrosis factor-α (TNF-α), cyclooxygenase-2 (COX-2), alpha smooth muscle actin (α-SMA), transforming growth factor beta (TGFβ), collagen type I alpha 1 (COL1A1), and heme oxygenase 1 (HO1) evaluated by RT-PCR. Bars represent the mean ± SEM of six independent experiments. * p < 0.05 versus undifferentiated cells; *° p < 0.05 versus differentiated cells.
