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Published online Apr 4, 2007. doi:  10.1186/1748-7161-2-6

Figure 4

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Age variations of melatonin levels. The hormone secretion increases in early childhood. In adolescent there is a decrease of the hormone concentration. The levels continued to decline gradually during middle age. In old population the levels of melatonin in serum are very low. (Modified from [88]).

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