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January 1981 High temperatures and certain chemicals can significantly change the amino acid content in human hair.
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October 2007 in “PubMed” Amino acids in conditioners improve hair strength, hydration, and color retention.
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April 2015 in “Current problems in dermatology” A more sensitive assay was developed to detect enzyme activity converting arginine to citrulline in hair follicles.
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January 1981 Nucleophilic reagents break down hair keratin, forming more lanthionine and lysinoalanine than in wool.
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December 2023 in “Sains Malaysiana” The enzyme Rand protease works well for leather dehairing and its stability is important, with Leu75 playing a key role.
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