Fig. 3From: Changes in thyroid hormones, leptin, ghrelin and, galanin following oral melatonin administration in intact and castrated dogs: a preliminary studyChanges and comparison of overall means±SEM concentration of T4 hormone between control, melatonin, castrated and melatonin+castrated groups. Each black round point indicates mean concentration of T4 hormone of each dog during study. Different letters indicate significant differences between groups (P < 0.05)Back to article page