13 citations
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October 2008 in “PubMed” This study examined hair curvature in Japanese women, finding that 47% have curved hair, and identified structural differences in hair fiber, which resemble those in wool fibers.
4 citations
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December 1989 in “The Journal of Dermatology” This study suggests that the amino acid composition of fibrous proteins in normal human hair is similar to that of stratum corneum proteins, particularly in cysteine and glycine content.
July 2009 in “International Journal of Cosmetic Science” This study found that 53% of Japanese women have straight hair while 47% have varying degrees of curved hair, with distinct structural differences observed in the internal makeup of curved hair fibers.
12 citations
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August 1984 in “Genetics Research” In this study, researchers found that the naked (N) gene in mice indirectly affects the synthesis of structural proteins in mouse hair, resulting in reduced high tyrosine protein content and unusual amino acid compositions.
51 citations
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January 2007 in “The journal of investigative dermatology/Journal of investigative dermatology” This study identified a novel keratin-associated protein, KAP24.1, which is specifically expressed in the human scalp and located in the hair cuticle.