Fig. 3. The effect of BA on serum testosterone levels of normal and streptozotocin-nicotinamide-induced diabetic mice. Values are presented as mean±standard error, n=10. DM: diabetes mellitus, BA: betulinic acid (mg/kg), Met: metformin. ^**p<0.01, ^***p<0.001 compared with the DM group, ^###p<0.001 compared with the control group.