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The pigment pheomelanin gives red hair its distinctive color. Red hair has far more of the pigment pheomelanin than it has of the dark pigment eumelanin. The genetics of red hair appear to be associated with the melanocortin-1 receptor (MC1R), which is found on chromosome 16. In 1995, Valverde, et al. identified alleles on MC1R associated with ...
Red hair ranges from light strawberry blond shades to titian, copper, and completely red. Red hair has the highest amounts of pheomelanin, around 67%, and usually low levels of eumelanin. At 1–2% of the west Eurasian population, it is the least common hair color in the world. It is most prominently found in the British Isles and in Udmurtia ...
People with freckles and no red hair have an 85% chance of carrying the MC1R gene that is connected to red hair. People with no freckles and no red hair have an 18% chance of carrying the MC1R gene linked to red hair. [12] Eight genes have been identified in humans that control whether the MC1R gene is turned on and the person has red hair. [13]
Whereas Titian hair is a brownish shade of red hair, auburn hair is specifically defined as including the actual color red. Most definitions of Titian hair describe it as a brownish-orange color, [1] [2] but some describe it as being reddish. [3] This is in reference to red hair itself, not the color red.
Red hair is one potential manifestation of a gene mutation in the melanocortin 1 receptor (MC1R). [4] While red hair most frequently occurs among European peoples, it is also present among persons of Asian descent or Africans with European admixture (though extremely rare). [5]
Nutrisse Ultra Color. This permanent dye is made to stay bright for up to eight weeks and helps to keep strands healthy throughout the dye process with avocado, olive, and shea oils.
Agouti-signaling protein is a protein that in humans is encoded by the ASIP gene. [5] [6] It is responsible for the distribution of melanin pigment in mammals.[7] [8] Agouti interacts with the melanocortin 1 receptor to determine whether the melanocyte (pigment cell) produces phaeomelanin (a red to yellow pigment), or eumelanin (a brown to black pigment). [9]
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