CLAUS LUNAU / SCIENCE PHOTO LIBRARY CLAUS LUNAU / SCIENCE PHOTO LIBRARY
Pineal gland in the brain. Computer illustration of a human brain with most of the left hemisphere removed, showing the pineal gland. Front is at left. The pineal gland (pineal body). This small endocrine (hormone) gland is located in the epithalamus, near the centre of the brain. It produces melatonin, a serotonin-derived hormone that affects the modulation of sleep patterns in both seasonal and circadian rhythms.
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