NCI Dictionary of Cancer Terms

The NCI Dictionary of Cancer Terms features 8,525 terms related to cancer and medicine.

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melatonin
(MEH-luh-TOH-nin)
A hormone made by the pineal gland (tiny organ near the center of the brain). Melatonin helps control the body’s sleep cycle, and is an antioxidant. It is also made in the laboratory and sold as a supplement.