KERATIN 87 lysine 4, tyrosine 4, histidine 2, methionine 2 and tryptophan 2. SUMMARY 1. Values are given for nineteen of the common amino-acids in human hair keratin.2. These account for about 90 % of the expected weight and 86% of the nitrogen of the keratin; melanin plus ammonia account for another 3 % of the weight and 7 7 % of the nitrogen.
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Lang et al. (1952) studied this question.
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