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Melanin

melanin

(Science: protein) pigments largely of animal origin. High molecular weight polymers of indole quinone. Colours include black/brown, yellow, red and violet. Found in feathers, cuttle ink, human skin, hair and eyes and in cellular immune responses and wound healing in arthropods. Insoluble pigments that account for the color of e.g. skin and scales and feathers.A pigment found in [[ melanophores that control eye, hair and skin colour depending on the [[genotype and external environment of the organism (which can alter the colour of the eyes, hair and skin).


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Re: UV Effect on cell pigmentation (melanocytes)

it is based on the intensity of vu rays as the pigment melanin is purely designed for protection from uv rays is is deffinetey effected by the intensity of the light

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by rat554
Sat Mar 02, 2013 6:52 pm
 
Forum: Cell Biology
Topic: UV Effect on cell pigmentation (melanocytes)
Replies: 1
Views: 1416

Re: Why do Africans have large noses and lips?

I think the skin color difference is largely solved issue (UV, D-vitamin, melanin etc). There are respectable new studies including those of Nina Jablonski. There is rather good correlation between UV (UVA,UVB and UVC) high radiation and dark skin color. However ...

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by Antreas
Tue Nov 13, 2012 3:57 pm
 
Forum: Human Biology
Topic: Why do Africans have large noses and lips?
Replies: 30
Views: 186229

Re: Green mammals

... and amphibians don't have green pigmentation either. All mammals, birds, reptiles, and amphibians produce the same two types of pigmentation, melanin amd keratin. The reason many birds, reptiles and amphibians appear green is due to a number of factors, usually having to do with optical phenomenon. ...

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by biotag
Sat Sep 15, 2012 6:45 pm
 
Forum: Zoology Discussion
Topic: Green mammals
Replies: 11
Views: 11924

Genetics behind hazel eyes?

... multiple times on the internet about the genetics behing hazel eyes, saying that there is a new undiscovered modifier gene 'M' which produced more melanin for the 'G' (green eye gene) producing an eye color that is lighter than brown, but darker than green. There is also an 'm' gene which does ...

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by Montario
Fri Aug 03, 2012 10:00 pm
 
Forum: Genetics
Topic: Genetics behind hazel eyes?
Replies: 1
Views: 8312

Re: Hair Homogeneity and heterogeneity question

... I would say they are heterozygous because their hair darkens in adulthood, which means they have some genetic information (one allele) for making melanin.

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by biba56
Tue May 15, 2012 8:54 am
 
Forum: Genetics
Topic: Hair Homogeneity and heterogeneity question
Replies: 3
Views: 1616
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