Melanin | Wikipedia audio article
Channel: wikipedia tts
Date: 04/10/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Melanin


00:01:47 1 Humans
00:03:05 1.1 Eumelanin
00:04:03 1.2 Pheomelanin
00:05:02 1.2.1 Trichochromes
00:05:25 1.3 Neuromelanin
00:06:08 2 Other organisms
00:09:11 2.1 Plants
00:09:55 3 Biosynthetic pathways
00:10:58 4 Microscopic appearance
00:11:39 5 Genetic disorders and disease states
00:16:58 6 Human adaptation
00:17:08 6.1 Physiology
00:18:42 6.2 Evolutionary origins
00:20:13 6.3 Effects
00:22:09 7 Physical properties and technological applications
00:23:10 8 See also



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SUMMARY
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Melanin ( (listen); from Greek: μέλας melas, "black, dark") is a broad term for a group of natural pigments found in most organisms. Melanin is produced through a multistage chemical process known as melanogenesis, where the oxidation of the amino acid tyrosine is followed by polymerization. The melanin pigments are produced in a specialized group of cells known as melanocytes.
There are three basic types of melanin: eumelanin, pheomelanin, and neuromelanin. The most common type is eumelanin, of which there are two types—brown eumelanin and dark brown eumelanin. Pheomelanin is a cysteine-derivative that contains polybenzothiazine portions that are largely responsible for the color of red hair, among other pigmentation. Neuromelanin is found in the brain. Research has been undertaken to investigate its efficacy in treating neurodegenerative disorders such as Parkinson's.In the human skin, melanogenesis is initiated by exposure to UV radiation, causing the skin to darken. Melanin is an effective absorbent of light; the pigment is able to dissipate over 99.9% of absorbed UV radiation. Because of this property, melanin is thought to protect skin cells from UVB radiation damage, reducing the risk of folate depletion and dermal degradation, and it is considered that exposure to UV radiation is associated with increased risk of malignant melanoma, a cancer of melanocytes (melanin cells). Studies have shown a lower incidence for skin cancer in individuals with more concentrated melanin, i.e. darker skin tone. However, the relationship between skin pigmentation and photoprotection is still uncertain.