40 citations
,
February 1990 in “Journal of The American Academy of Dermatology” A 17-year-old developed woolly hair nevus in adolescence, which is unusual, and over time the hair darkened and straightened slightly, but microscopic changes persisted.
6 citations
,
February 2013 in “Veterinary Dermatology” A young cat had a rare hair condition with twisted hair shafts but stayed healthy.
23 citations
,
July 1994 in “Journal of Dermatological Science” Pili torti hair twists due to uneven outer root sheath cell development.
4 citations
,
November 2016 in “The Journal of Dermatology” Pili torti hair is fragile due to loose keratin filaments and weak disulfide bonds.
7 citations
,
August 2006 in “Biopolymers” Researchers extracted tiny keratin filaments from human hair by unzipping its outer layer.