For discussing the functions of different structures of all organisms.
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I know that melatonin hormone is released by the pineal gland upon the fall of the night, so we can go to sleep easier. But nowhere I could find how the daily release of this hormone is triggered in humans that live on the north pole or so, so the sun wouldn't go down for 6 months and then it would be dark for another six months. It assumes the existence of other stimulatory mechanisms for the daily melatonin release...
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