Fig. 4From: Synthesis of acyl oleanolic acid-uracil conjugates and their anti-tumor activityCell morphological observation for cell apoptosis induction on the Hep-G2 cells treated by conjugate 4c. a Control cells; b, c cells treated by 4c for 24 h; cells were stained by Hoechst 33258, and selected visual fields illustrating the condensed chromatin (white arrow) as occurrence of cell apoptosis are shown (magnification ×200)Back to article page