Abstract
Background The thyroid glands function and structure are influenced by several psychomotor stimulants like: temperature, drugs, chemicals and light. The purpose of this study was to investigate the effect of continuous darkness on the thyroid glands of male rats. Despite so many previous works to explore the effect of exogenous or endogenous melatonin on thyroid, there are few studies dealing with the outcome of progressively increasing phases of darkness on thyroid architecture, according to the available literatures.
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