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・ Red Hills Wind Farm
・ Red Hills, Chennai
・ Red hocicudo
・ Red Hodges
・ Red Hoff
・ Red Holloway
・ Red Holocaust (book)
・ Red Holt
・ Red Holzman
・ Red Hong Yi
・ Red gurnard
・ Red gurnard (disambiguation)
・ Red gurnard perch
・ Red Hacker Alliance
・ Red Hackle Pipe Band
Red hair
・ Red Hair (film)
・ Red Haircrow
・ Red hake
・ Red hall
・ Red Hall (Slovenia)
・ Red Hamill
・ Red Hammer Records
・ Red hand
・ Red Hand Commando
・ Red Hand Day
・ Red Hand Defenders
・ Red Hand of Doom
・ Red Hand of Ulster
・ Red Handed


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Red hair : ウィキペディア英語版
Red hair


Red hair occurs naturally in 1–2% of the human population. It occurs more frequently (2–6%) in people of northern or western European ancestry, and less frequently in other populations. Red hair appears most commonly in people with two copies of a recessive allele on chromosome 16 which produces an altered version of the MC1R protein.
Red hair varies from a deep burgundy through burnt orange to bright copper. It is characterized by high levels of the reddish pigment pheomelanin and relatively low levels of the dark pigment eumelanin. The term redhead has been in use since at least 1510. It is associated with fair skin color, lighter eye colors (gray, blue, green, and hazel), freckles, and sensitivity to ultraviolet light.〔
Cultural reactions have varied from ridicule to admiration; many common stereotypes exist regarding redheads and they are often portrayed as fiery-tempered.
== Geographic distribution ==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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