Assertion: melatonin | /r/HasProperty | substance
Facets:
Source sentences:
text: Melatonin , chemically N-acetyl-5-methoxytryptamine, is a substance found in animals, plants, fungi and bacteria.
text: Melatonin and melanin are two substances present in living organisms.
text: Melatonin is a substance that your body normally makes.
text: Melatonin is a substance that your body normally makes.
text: Melatonin is a substance that your brain's pineal gland secretes, producing the effect of sleepiness.
text: Melatonin is a substance that is normally produced in the brain by the pineal gland.