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Pineal Gland and Gonads
Pineal gland
The pineal gland is an endocrine gland located in the middle of the brain. It is responsible for the production of melatonin, a hormone which acts as an antioxidant and is involved in the regulation of biological rhythms.
Source
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"Illu pituitary pineal glands."
http://commons.wikimedia.org/wiki/File:Illu_pituitary_pineal_glands.jpg
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