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In this study, researchers found that none of the participants were color blind and reported varying lengths of index and ring fingers among them, exploring a possible link between these finger length ratios and sex-influenced gene expression.

This study suggests that keratin peptide signatures in human hair shafts may potentially be used to distinguish gender and ethnicity, although further validation with larger samples is needed.

This study found that specific DNA variants in the TCHH, WNT10A, and FRAS1 genes are associated with predicting straight hair in Europeans, showing high sensitivity but low specificity, especially using a neural networks approach.

This review discusses the use of different biological samples, including hair, for drug testing and highlights the complexities and considerations involved in interpreting results; it reports no new findings.

This study observed unique ultrastructural changes in a 4-year-old girl with pili trianguli et canaliculi that may affect hair shaft surface characteristics due to inner root sheath alterations.

This study found that women with FPHL may have an increased cardiovascular risk, as indicated by associations with metabolic syndrome, insulin resistance, and elevated biochemical markers.

This review discusses female pattern hair loss, emphasizing its complex causes and the limited treatment options available, and reports no new clinical results.

This study suggests that the presence of more than six vellus hairs in the frontal scalp at 20-fold magnification can be an additional criterion for diagnosing early female pattern hair loss.

This study found that T cytokeratins appear more gradually and with complex coexpression patterns in developing nail structures compared to the more abrupt transition in hair follicles.

This study reports pseudopili annulati in a dark-haired Chinese girl, identifying the unique appearance and structural characteristics of her hair without finding abnormalities in the cuticle and cortex.

This study found that a family history of androgenetic alopecia and specific trichoscopic features are key factors in predicting female pattern hair loss, and the developed nomogram model may help improve disease management by assessing these risks.

This report identified longitudinal grooves in the hair shafts of four children, diagnosing them with uncombable-hair syndrome.

Isolated patchy heterochromia with pili annulati can occur without other health issues.

This study shows that microdiffraction experiments reveal structural layers in keratinous tissues, each with different keratin types, potentially explaining their dual role as mechanical support and chemical barriers.

This study examined the microscopic characteristics of hair or feather in five animal drug components of the Shenrongbian pill, identifying distinctive medulla cell shapes and hair cuticle patterns for each component.

This study underscores the use of hair analysis in forensic toxicology, highlighting its ability to detect drugs such as opioids and amphetamines, while noting limitations related to hair growth cycles, result interpretation, and cost of techniques.

Keratin fibers in hair twist left-handed.

This research suggests that geometric classification of hair into fewer groups may be more reliable and useful for studying hair characteristics, rather than racial descriptions, especially in medical and forensic applications.

This study found that laser-based goniophotometry can effectively monitor changes in hair surface reflection related to color and cuticle cell tilt across different ethnic origins.

This research identified K31 as a new marker for distinguishing clear secretory cells in human eccrine sweat glands, aiding in differentiating between distinct cell types within these glands.

This review discusses the characteristics and diagnostic challenges of fibrosing alopecia pattern distribution, proposing an algorithm for hair transplantation, but reports no new clinical results.

This study developed a novel system that can automatically estimate hair loss parameters from images without expert input, reporting satisfactory results from testing on samples collected in Kolkata.

This chapter reviews trichoscopic-pathologic correlations in Frontal Fibrosing Alopecia and reports no new clinical results; the authors discuss genetics, clinical patterns, and unusual variants associated with this condition.

This report describes several cases of pili annulati in children, highlighting its genetic predisposition and distinctive "zebra stripe" hair pattern, but notes no effective treatment is available.

This article discusses distinguishing features of Diffuse Alopecia Areata and Fibrosing Alopecia in a Pattern Distribution, but reports no new clinical results.

Keratin patterns in hair follicles help understand hair growth and potential hair and nail disorders.

This study found that trichoscopic measurements of hair density and diameter are useful for assessing the severity of female pattern hair loss and its progression.