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melanin
(redirected from excess melanin)

    Also found in: Dictionary/thesaurus, Medical, Encyclopedia, Wikipedia 0.06 sec.

melanin

Brown pigment that gives colour to the eyes, skin, hair, feathers, and scales of many vertebrates. In humans, melanin helps protect the skin against ultraviolet radiation from sunlight. Both genetic and environmental factors determine the amount of melanin in the skin.



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