Melanin coagulates with step of biochemical reaction
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Melanin (/ˈmɛlənɪn/ (listen); from Greek:μέλας melas, "black, dark") is a broad term for a group of natural pigments found in mostorganisms. Melanin is produced through a multistage chemical process known asmelanogenesis, where the oxidation of theamino acid tyrosine, is followed bypolymerization. The melanin pigments are produced in a specialized group of cells known as melanocytes.
MelaninIdentifiers
CAS Number
8049-97-6
ChemSpider
4884931 
PubChem CID
6325610
Properties
Chemical formula
C18H10N2O4Molar mass318.288 g·mol−1Density1.6 to 1.8 g/cm3Melting point< −20 °C (−4 °F; 253 K)Boiling point450 to 550 °C (842 to 1,022 °F; 723 to 823 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references
Not to be confused with melamine or melatonin.

Melanin pigment (light refracting granular material—center of image) in a pigmented melanoma.
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 black eumelanin. Pheomelanin is acysteine-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. [1]
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.[2] Because of this property, melanin is thought to protect skin cells from UVB radiation damage,
MelaninIdentifiers
CAS Number
8049-97-6
ChemSpider
4884931 
PubChem CID
6325610
Properties
Chemical formula
C18H10N2O4Molar mass318.288 g·mol−1Density1.6 to 1.8 g/cm3Melting point< −20 °C (−4 °F; 253 K)Boiling point450 to 550 °C (842 to 1,022 °F; 723 to 823 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references
Not to be confused with melamine or melatonin.

Melanin pigment (light refracting granular material—center of image) in a pigmented melanoma.
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 black eumelanin. Pheomelanin is acysteine-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. [1]
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.[2] Because of this property, melanin is thought to protect skin cells from UVB radiation damage,
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