10 citations
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May 2017 in “Symmetry” This study observed that among !Kung San males, adult androgen levels, particularly DHT, were negatively associated with indicators of fluctuating and directional asymmetry, suggesting a link to phenotype quality.
March 2025 in “Journal of Craniofacial Surgery” This study found that male hairlines naturally exhibit significant rightward asymmetry, suggesting that embracing this asymmetry in hair transplant procedures may result in more natural-looking outcomes.
25 citations
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November 2008 in “Facial Plastic Surgery” This article explores factors in designing a personalized hairline, favoring a flared design approach, and reports no new evidence.
200 citations
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November 1997 in “Planta” This study found that while a tip-focused calcium gradient influences localized growth in root hairs and pollen tubes, it is not the primary determinant of growth direction in root hairs of Arabidopsis thaliana.
September 2025 in “The American Journal of Medical Sciences and Pharmaceutical Research” In this analysis, the authors examine how hairdressing techniques like thinning and micro-graduation can correct women's hairlines by softening optical contours and enhancing visual symmetry, emphasizing the relevance of individual factors such as morphology and stylistic expectations in selecting these non-medical approaches.