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Histological preparations of the left ventricles from different groups of rats. (A) Control animals; (B) animals treated with melatonin (MEL) (~7 mg/kg of body weight per day); (C) animals treated with isoprenaline hydrochloride (ISO) (85 mg/kg of body weight twice); (D) animals treated with MEL + ISO. The yellow stroke restricts the area of degenerative changes. The foci of granular dystrophy are indicated by yellow arrows.
