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Pineal gland - class-VIII
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The recently discovered hormone, melatonin is derived from serotonin which is synthesised by
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Pineal gland
💡 Explanation:
The pineal gland is a small endocrine gland in the vertebrate brain. It produces melatonin, a serotonin derived hormone, that affects the modulation of sleep patterns in both seasonal and circadian rhythms.