Fig. 5. (A) MTT reduction curve for Hep-2 cells cultured in the presence of 10% FBS, 10% HPL, and 5% HPL and in SFM (P <0.05). Data are expressed as means±SD of three independent experiments. (B) MTT reduction difference between cells cultivated in 10% and 5% HPL and SFM and those cultured in 10% FBS (P <0.05).