Figure 1: Effects of oleanolic acid (OA) on the levels of collagens I (a) and III (b) and the ratio of collagens I/III (c). The levels of collagens I and III and the ratio of collagens I to III significantly increased in the control group on day 56 postoperation when compared with the normal group. The administration of OA for 28 days reversed these changes dramatically and dose dependently in comparison with the control group. compared with the normal group; and compared with the control group. Data are expressed as the mean ± SD. .