Histoenzymological reactions of the thyroid gland in irradiated and previously melatonin-treated irradiated rats.

The authors were investigating the histoenzymological reactions of the thyroid gland of melatonin-treated and untreated rats, in toto irradiated by 8 Gy gamma rays. Although both groups reacted positively, the reaction intensity of the melatonin-treated group was more intense. It is suggested that melatonin has radiothyreoprotective effects under given conditions.