Figure 3: Histological sections of male Wistar rat livers after treatment with Oncidium flexuosum Sims. crude extract. A, B, C) sections stained with bromophenol blue and D, E, F) sections submitted to the TUNEL method. A, E) Control group; B) group G250; C, F) group G500; D) positive control group. TUNEL positive nuclei (brown) was higher in treated animals (F) compared to the negative control (E). Magnification 200X.