eumelanin


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eumelanin

(juːˈmɛlənɪn)
n
(Biochemistry) a form of melanin found in human skin and hair, more common in people with dark skin
References in periodicals archive ?
Warner took another approach and created a treatment that restores what is missing from gray hair: the natural pigment eumelanin.
The scientists found granules in the fossil that, when compared to modern fish eyes, are made of eumelanin a pigment that absorbs light and helps animals see, Press Tv reported.
he melanocytes, which produce the melanin, can either produce a red melanin -- pheomelanin -- or dark brown -- eumelanin.
It's the combination of yellow, red and blue pigmentation called pheomelanin and black to brown pigmentation called eumelanin that gives mammals and birds their skin color.
Regarding melanin quantification, to determine eumelanin concentrations in a separate set of rusty head feathers, we extracted pigments using [H.
cooperation of dopachrome conversion factor with phenoloxidase in the eumelanin pathway in haemolymph of Locusta migratoria (Insecta).
The plumage, skin and eye colour of birds are mainly determined by the relative content and distribution of eumelanin and phaeomelanin, which is produced by melanocytes present in the epithelium, iris, and feather follicles of birds.
Melanocytes produce two forms of melanin, black-brown eumelanin and red-yellow pheomelanin.
The most common form of biological melanin is eumelanin, a brown-black polymer of dihydroxyindole carboxylic acids.
That tiny difference prevents the tiger from making the reddish and yellow pheomelanin pigments, but does not affect the production of the black pigment eumelanin.
Light-skinned redheads with freckles and an inability to tan have trouble producing the black-grown pigment eumelanin, which absorbs harmful UV rays - instead producing the red-yellow pigment pheomelanin which provides a weak UV shield.