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Pineal gland labeled drawing.
Median section of human brain showing location of the pineal gland, an endocrine gland that produces melatonin, a hormone that affects the wake sleep patterns and seasonal rhythms, labeled diagram.
© Alila Medical Media
Image size: 22.5 Mpixels (64.4 MB uncompressed) - 5001x4501 pixels (16.7x15 in / 42.3x38.1 cm at 300 ppi)