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Melatonin

Medical term · M

A hormone that regulates the body’s sleep-wake cycle.

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Related terms

Pineal gland

A gland located in the middle of the brain, between the brain’s two hemispheres, that produces melatonin in response to declining light.
Melanoma

The most dangerous type of skin cancer.
Membrane

A thin layer of tissue that surrounds or lines organs or cavities.

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