In humans, reddish orange hair has been linked to certain variants of the melanocortin-1 receptor (MC1R) gene. This gene controls the production of melanin, the pigment that gives hair ...
Mammals have only two pigments, which are two colors of melanin: eumelanin (dark brown, blackish) and pheomelanin (yellowish, reddish or orange). Redheads only produce pheomelanin, while dark ...
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