The protein expression of CCAAT enhancer binding protein (C/EBP) delta in HepG2 cells incubated with oleic acid. The HepG2 cells were treated with different concentrations of oleic acid (0, 25, 50, 100, or 200 μmol/L) for 72 h. The upper panels are western blots of C/EBP delta. Densitometric quantification of protein levels (mean±SD, n=4); values not sharing a common alphabet letter are significantly different. bP<0.05, cP<0.01 vs control.