melanin

Definitions

  • WordNet 3.6
    • n melanin insoluble pigments that account for the color of e.g. skin and scales and feathers
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Webster's Revised Unabridged Dictionary
  • Interesting fact: The reason why hair turns gray as we age is because the pigment cells in the hair follicle start to die, which is responsible for producing "melanin" which gives the hair colour
    • n Melanin (Physiol) A black pigment found in the pigment-bearing cells of the skin (particularly in the skin of the negro), in the epithelial cells of the external layer of the retina (then called fuscin), in the outer layer of the choroid, and elsewhere. It is supposed to be derived from the decomposition of hemoglobin.
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Century Dictionary and Cyclopedia
    • n melanin The black pigment of the hair, choroid, retina, and epidermis of colored races; also, the dark pigment seen in melanæmia and in melanosarcoma and melanocarcinoma. The pigments in these cases may, however, be different.
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Etymology

Webster's Revised Unabridged Dictionary
Gr. me`las me`lanos, black

Usage

In literature:

On closer examinations he found that each of these nodules contained a few granules of the coal-black melanin of malarial fever.
"Insects and Diseases" by Rennie W. Doane
The melanotic cancer contains abundant pigment, melanin, within its cells.
"A System of Practical Medicine by American Authors, Vol. I" by Various
The pigment of the hair seems to consist of those pigmentary substances known as melanins.
"The Cambridge Natural History, Vol X., Mammalia" by Frank Evers Beddard
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In news:

The blue-eye mutation turned off the gene that produces melanin in the eyes.
There is a component in our skin cell DNA called melanin that determines skin pigmentation or the lack thereof.
Keep in mind, GlyMed's Villar notes, that if your hyperpigmented clients stop using a topical tyrosinase inhibitor for a week or so, their skin will probably initiate melanin production once again.
University Study Advances Understanding of Melanin Formation .
Mercury is sometimes illegally added to creams because the metal blocks production of melanin, which gives skin its pigmentation.
Dr Gregg Homer at Stroma Medical in California has come up with a laser procedure that removes the brown pigment, known as melanin, in the iris.
The product helps soothe sunburned or sun-stressed skin with ingredients like aloe vera, vitamin E, bio-melanin, green tea, calendula and chamomile.
Whether triggered by sunlight, stress, or inflammation, discoloration reflects an excess of melanin, says Sonia Badreshia-Bansal, M.D.
It plays a vital role in bringing vitamin A from the liver to the retina in order to produce melanin, a protective pigment in the eyes.
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In science:

Trumbauer, et al., 2002 Melanin-concentrating hormone 1 receptor-deļ¬cient mice are lean, hyperactive, and hyperphagic and have altered metabolism.
Robust identification of local adaptation from allele frequencies
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