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In this case series, mesenchymal stem cell exosomes were reported to improve hair length, density, pigmentation, and cuticle layer recovery in three patients with acquired trichorrhexis nodosa, suggesting potential as a therapeutic approach for this hair condition.

This study demonstrates that Rac1 activity is essential for normal hair follicle formation but influences hair structure and pigmentation, in terminal differentiation, through alterations in hair shaft, cuticle, and pigmentation organization.

This study observed varying levels of polyamines in different compartments of rat hair follicles, indicating their potential involvement in hair growth, especially in the matrix and inner root sheath layers.

This study found that hair germ and epidermal basal cells differ in keratin expressions in rat hair tissues, with hair-specific keratins appearing after the differentiation of each layer.

This study reported that fermented grapeseed oil may enhance hair permeability and improve strength and color retention in chemically treated hair compared to regular grapeseed or silicone oils.

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.

This study found that the 16th-century mummified hair from a female mummy in Paju was remarkably well-preserved, with the hair's ultrastructural features maintained likely due to a calcium-rich surface coat.

This study found that the hair of a 16th-century female mummy discovered in Paju was remarkably well-preserved due primarily to a calcium-based surface coating that likely inhibited moisture and microorganism infiltration.

This study found that papain/bisulfite disintegrates human hair cuticles by dissolving the endocuticle, potentially accelerated by ethanol's removal of cell membrane material.

This review explores theories on the evolution of hair from synapsid scales and glands, proposing mechanisms supported by comparative studies, but reports no new experimental findings.

This study found that crossbred lambs fed liquid diets with reconstituted cow's milk initially grew wool without crimp, with crimp resuming two weeks post-weaning.

Hair increases in size when it absorbs water, and treatments like bleaching affect how much water it can take in.

This review highlights key considerations for developing effective herbal hair oils, focusing on carrier selection, bioactive extraction, and standardization, and suggests incorporating advanced delivery systems like nanoemulsions to improve global manufacturing practices.

Pollution exposure speeds up hair damage.

This study supports the idea that steatocystoma multiplex is a hamartomatous condition and suggests it may be a variant of eruptive vellus hair cyst, both originating in the pilosebaceous duct.

This study found that the formation of the fibre cuticle surface in Merino sheep is similar to the epidermal stratum corneum process and not from a modified plasma membrane as previously thought.

In this study, autophagy was commonly observed during keratinization in neonate rat hair follicles, suggesting lysosomal proteases and cytoplasmic enzymes may coordinate in hair follicle cell differentiation.

This study developed new label-free imaging methods to analyze human hair, identifying distinct chemical environments within cuticle layers and changes in hair structure caused by depilatories, while showing that the treatments tested did not significantly affect skin cell differentiation or proliferation.

This study found that wool felting in Ukrainian Carpathian Mountain sheep is linked to significant changes in fatty acid composition, particularly highlighting a decrease in 18-methyleicosanoic acid in bound lipids, suggesting it as a potential marker for cuticle lipid layer damage during felting.

This study found that a hair treatment cream using keratin protein from chicken feathers effectively improved damaged hair, particularly by repairing the surface layer.

The study found that pili bifurcati causes hair to intermittently split into two branches, each with its own outer layer.

Loose anagen hair syndrome causes easily shed hair but usually improves with time.

This review discusses the unique characteristics and disorders of Asian hair, emphasizing the need for more comprehensive studies in this area.

This study reports that different animal species exhibit distinct hair scale patterns and elemental compositions, which can aid forensic investigations in identifying animal hair.

Runx1 helps control the KAP5 gene in human hair follicles.

This study found that the weak tensile strength of pili torti hair may result from loose keratin intermediate filaments due to abnormalities in disulfide bonds.

This study found that incorporating CTA2-BADG, a modified hair-rebonding compound, into damaged hair significantly improved surface morphology and tensile strength by using charge-conversion chemistry to enhance penetration into the hair shaft.

This study found that basal cell carcinoma exhibits patterns of hair follicle differentiation but is stuck in telogen arrest, which can be rescued by adding noggin and TGF-β2 in vitro.

This study proposed the existence of a membrane-like structure between the cuticle and cortex in human hair, which may provide strong protection against external stimuli.

This study found that heating damages Asian black male and female hair cuticles without altering their structure, with damage severity increasing at higher temperatures and longer exposure times.