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This is an accepted version of this page This is the latest accepted revision, reviewed on 28 January 2025. "Skin pigmentation" redirects here. For animal skin pigmentation, see Biological pigment. Extended Coloured family from South Africa showing some spectrum of human skin coloration Human skin color ranges from the darkest brown to the lightest hues. Differences in skin color among ...
Skin pigmentation is an evolutionary adaptation to various UVR levels around the world. As a consequence there are many health implications that are the product of population movements of humans of certain skin pigmentation to new environments with different levels of UVR. [ 3 ]
It is an autosomal recessive disorder characterized by a congenital reduction or absence of melanin pigment in the skin, hair, and eyes. The estimated frequency of OCA2 among African-Americans is 1 in 10,000, which contrasts with a frequency of 1 in 36,000 in white Americans. [ 55 ]
Through a process called melanogenesis, melanocytes produce melanin, which is a pigment found in the skin, eyes, hair, nasal cavity, and inner ear. This melanogenesis leads to a long-lasting pigmentation, which is in contrast to the pigmentation that originates from oxidation of already-existing melanin.
The actual skin colour of different humans is affected by many substances, although the single most important substance determining human skin colour is the pigment melanin. Melanin is produced within the skin in cells called melanocytes and it is the main determinant of the skin colour of darker-skinned humans.
The answer rests in something called melanocytes -- or the cells inside a zebra that produce the black pigment of their skin. Case solved! READ MORE: Goat on the loose quickly captured, but steals ...
It is widely supposed that light skin pigmentation developed due to the importance of maintaining vitamin D3 production in the skin. [24] Strong selective pressure would be expected for the evolution of light skin in areas of low UV radiation. [15] Evolutionary model of human pigmentation in three continental populations.
Large patches of scaly skin, covering the chest and belly, were glowing in a striking golden-yellow color under the UV. The fossil skin looked really exquisite, covered by tiny, rounded scales of ...