(a)
(b)
(c)
(d)
Figure 5: Lipid peroxidation quantified by MDA levels in plasm ((a), μmol/mL plasm) and in extracts (U/mg protein) of prostate (b), testis (c), and epididymis (d). C1: one-week control; M1: one-week control treated with melatonin; D1: one-week diabetic; MD1: one-week diabetic treated with melatonin; C2: two-month control; M2: two-month control treated with melatonin; D2: two-month diabetic; MD2: two-month diabetic treated with melatonin ( animals/group). Different lowercase letters indicate statistical differences among short-term experimental groups (parametric data: (b), (c), and (d); nonparametric data: (a)). Different uppercase letters indicate statistical differences among long-term experimental groups (parametric data: (d); nonparametric data: (a), (b), and (c)). Indicates a statistical difference between experimental periods (parametric data). # Indicates a statistical difference between experimental periods (nonparametric data).