Additionally, the slight difference in cysteic acid relative content evolution between the dark brown (4/0) and extra light blonde (9/0) hair, the dark brown hair showing an overall trend towards a slower increase, can be attributed to the photoprotective effect of melanin which retards the protein oxidation as melanin and keratin compete for the absorption of photons.
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Carbonylation of hair proteins: A robust biomarker of molecular and structural oxidative damage in hair fibres.
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