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melatonin
a hormone secreted by the pineal gland in inverse proportion to the amount of light received by the retina, important in the regulation of biorhythms: in amphibians, it causes a lightening of the skin.
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Јангце
The longest river in Asia, and the ('''third-longest in the world'''). It flows for 6,418 kilometres (3,988 mi) from the glaciers on the Tibetan ...