Guard hair length is positively correlated with guard hair diameter and down fiber length, but negatively correlated with variation in guard hair diameter and down fiber diameter.
June 2025 in “Molecular Genetics & Genomic Medicine” Severe genetic variants in children with a specific adrenal condition match predicted symptoms well, but milder variants do not.
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October 2003 in “Annales de Génétique” A specific gene mutation causes different hair defects in Indian monilethrix families.
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April 2018 in “Hormones” No consistent link between genotype and phenotype in 5-α-Reductase type 2 deficiency.
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April 2014 in “American Journal of Medical Genetics” Boys with less severe EDA mutations in XLHED have milder symptoms and better sweat and hair production.