| 21. | It seems likely that the first modern humans had relatively large numbers of eumelanin-producing melanocytes.
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| 22. | High amounts of black eumelanin result in black hair, while low concentrations result in gray hair.
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| 23. | It causes the dilution of both eumelanin and phaeomelanin to a light grey or buff, respectively.
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| 24. | Although eumelanin is strongly photoprotective, Thody said, phaeomelanin may actually contribute to skin damage and disease.
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| 25. | A small amount of black eumelanin, in the absence of other pigments, results in grey hair.
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| 26. | Eumelanin, which has two subtypes of black or brown, determines the darkness of the hair color.
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| 27. | Without melanocortin 1 receptor to signal eumelanin production in melanocytes, this Labrador retriever has a yellow coat.
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| 28. | Higher eumelanin levels also can be a disadvantage, however, beyond a higher disposition toward vitamin D deficiency.
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| 29. | Blond hair can have almost any proportion of pheomelanin and eumelanin, but has only small amounts of both.
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| 30. | Red hair has the highest amounts of pheomelanin, around 67 %, and usually low levels of eumelanin.
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