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eumelanin

One of the pigment molecules found in the coat and pigmented retinal epithelium of mammals. It is derived from the metabolism of tyrosine and is normally black in color. Its precise ...

eumelanin

eumelanin   Quick reference

A Dictionary of Forensic Science

Reference type:
Subject Reference
Current Version:
2013
Subject:
Science and technology, Law
Length:
20 words

... A type of melanin (colouring pigment) found in the skin and hair; dark brown to black in...

eumelanin

eumelanin  

One of the pigment molecules found in the coat and pigmented retinal epithelium of mammals. It is derived from the metabolism of tyrosine and is normally black in color. Its precise coloration is ...
erythrism

erythrism  

In mammals, the possession of red hair, caused most commonly by a lack of black pigment (eumelanin) which allows the red pigment (phaeomelanin) to dominate.
pheomelanin

pheomelanin  

or (esp. Brit.)a red and/or yellow pigment produced in mammalian melanocytes from tyrosine and cysteine. It is formed as an alternative to eumelanin by switching of the melanogenesis pathway at the ...
tortoiseshell cat

tortoiseshell cat  

A cat showing patches of orange and more darkly pigmented fur in its coat. The sex-linked gene O is responsible for the conversion of eumelanin to phaeomelanin, which gives the fur an orange ...
erythrism

erythrism   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

...In mammals, the possession of red hair, caused most commonly by a lack of black pigment (eumelanin) which allows the red pigment (phaeomelanin) to...

phaeomelanin

phaeomelanin   Quick reference

A Dictionary of Forensic Science

Reference type:
Subject Reference
Current Version:
2013
Subject:
Science and technology, Law
Length:
33 words

...One of two types of melanin , the other being eumelanin, which are found in skin and hair. Phaeomelanin is a yellowish orange colour and is associated with red and blonde...

erythrism

erythrism   Quick reference

A Dictionary of Zoology (5 ed.)

Reference type:
Subject Reference
Current Version:
2020
Subject:
Science and technology, Life Sciences
Length:
26 words

... In mammals, the possession of red hair, caused most commonly by a lack of black pigment (eumelanin) which allows the red pigment (phaeomelanin) to...

pheomelanin

pheomelanin   Reference library

Oxford Dictionary of Biochemistry and Molecular Biology (2 ed.)

Reference type:
Subject Reference
Current Version:
2008
Subject:
Science and technology, Life Sciences
Length:
42 words

... or (esp. Brit.) phaeomelanin a red and/or yellow pigment produced in mammalian melanocytes from tyrosine and cysteine. It is formed as an alternative to eumelanin by switching of the melanogenesis pathway at the dopaquinone stage. How the switch operates is...

melanin

melanin   Reference library

Oxford Dictionary of Biochemistry and Molecular Biology (2 ed.)

Reference type:
Subject Reference
Current Version:
2008
Subject:
Science and technology, Life Sciences
Length:
94 words

...tyrosine, and are usually bound to protein. Plant melanins are called catechol melanins because they yield catechol on alkali fusion; animal melanins, termed eumelanins , arise from the formal polymerization of indole‐5,6‐quinone and thus, in contrast to plant melanins, contain nitrogen. Pheomelanin is red and/or yellow and is derived from tyrosine and cysteine, as an alternative to eumelanin production in melanosomes. —melanic ...

melanin

melanin   Quick reference

A Dictionary of Zoology (5 ed.)

Reference type:
Subject Reference
Current Version:
2020
Subject:
Science and technology, Life Sciences
Length:
59 words

... One of a group of dark pigments found in the skin and formed in melanoblast cells through the oxidation of tyrosine , phenylalanine , and other aromatic compounds. There are two chemically differing forms: the black-brown eumelanin and the red-yellow phaeomelanin. In many mammals, these alternate during the growth of a hair, resulting in a banded (‘agouti’)...

melanin

melanin   Quick reference

A Dictionary of Genetics (8 ed.)

Reference type:
Subject Reference
Current Version:
2014
Subject:
Science and technology, Life Sciences
Length:
206 words
Illustration(s):
1

...in bird feathers, reptile skins, insect exoskeletons, and the ink of cephalopods all contain melanins. Phaeomelanin is one of the pigments found in the coats of mammals. It is normally yellow in color, and is quantitatively and qualitatively controlled by the agouti locus. Eumelanin , one of the pigments found in the coat and pigmented retinal epithelium of mammals, is normally black in color, and its precise coloration is affected by a large number of mutant genes. Melanin macromolecule consists of polymers of indole 5,6-quinone and...

agouti

agouti   Quick reference

A Dictionary of Genetics (8 ed.)

Reference type:
Subject Reference
Current Version:
2014
Subject:
Science and technology, Life Sciences
Length:
112 words

...the grizzled color of the fur of mammals resulting from alternating bands of yellow (phaeomelanin) and black (eumelanin) pigments in individual hairs. The name is also given to the genes that control the hair color patterns. In the mouse more than 20 alleles have been described at the agouti locus on chromosome 2. The gene encodes a cysteine-rich, 131 amino acid protein that instructs the melanocytes in the hair follicle when to switch from making black to yellow pigment. The protein is translated by nearby follicle cells rather than in the melanocytes...

tortoiseshell cat

tortoiseshell cat   Quick reference

A Dictionary of Genetics (8 ed.)

Reference type:
Subject Reference
Current Version:
2014
Subject:
Science and technology, Life Sciences
Length:
102 words

...cat a cat showing patches of orange and more darkly pigmented fur in its coat. The sex-linked gene O is responsible for the conversion of eumelanin to phaeomelanin, which gives the fur an orange coloration. The O gene is epistatic to those autosomal genes, which give the coat a black or agouti color. Since the X chromosome is randomly inactivated in somatic cells during development, females heterozygous for O will show the tortoiseshell phenotype. The term calico is sometimes applied to tortoiseshell females that also have patches of white...

melanin

melanin   Quick reference

A Dictionary of Biomedicine (2 ed.)

Reference type:
Subject Reference
Current Version:
2019

...melanin A group of pigments found in feathers, cuttle ink, human skin, hair and eyes, some neurons, and a few other locations. Colours vary but include black/brown, yellow, red, and violet. All the melanins are high molecular weight polymers of indole quinone. Eumelanin is one of the two forms found in skin and hair and in the pigmented retinal epithelium of the eye. The oligomer is produced from 5,6-dihydroxyindole-2-carboxylic acid (DHICA) and is black or brown. Phaeomelanin , the other skin and hair form, is chemically distinct with its oligomer...

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