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Hair proteins have weak spots in their α-helical segments.

Keratin fibrils in hair form and stop growing at specific points in the follicle.

Sheep wool follicles absorb different amino acids at various rates and locations, which could affect wool growth based on diet and genetics.

Sheep wool follicles can metabolize both glucose and acetate using different pathways important for wool growth.

Angora goat hair grows faster and produces more protein than cashmere goat hair, and certain hormones and nutrients positively affect hair growth and protein synthesis.

Researchers extracted tiny keratin filaments from human hair by unzipping its outer layer.

Chemical treatments on bleached black hair change its internal structure by breaking and reforming bonds, and treatments with hydrolyzed eggwhite protein help repair it.

Using an enzyme and keratin treatment can significantly repair and strengthen damaged hair.

Estrogens significantly influence hair growth by interacting with receptors in hair follicles and may help regulate the hair growth cycle.

Androgens can cause hair growth in some areas and hair loss on the scalp.

Mouse hair follicle cells briefly grow during the early hair growth phase, showing that these cells are important for starting the hair cycle.

Hair keratin-associated proteins are essential for strong hair, with over 80 genes showing specific patterns and variations among people.

Hair growth can be induced by certain cells found at the base of hair follicles, and these cells may also influence hair development and regeneration.

Male pattern hair loss caused by follicular miniaturization; early diagnosis and treatment can reduce psychological burden.

Permanent waving weakens hair by altering its protein structure.

Feed restriction in sheep leads to finer wool fibers but may reduce wool quality.

Moisture content significantly affects how human hair breaks.

Two specific hair keratin genes are active during hair growth and decline as hair transitions to rest.

Dog hair grows back in about 14 weeks after being clipped for surgery, and the season doesn't really affect this growth rate.

Balding hair follicle cells are smaller, grow less well, and need more effort to culture than non-balding cells.

Human hair has more unsaturated fats inside than on the surface, and certain lipids may help bind the outer and inner layers together.

Certain gene mutations are linked to wool quality in sheep and could help in breeding for better wool.

The transition from growth to regression in Cashmere goat hair follicles involves changes in expression of genes related to keratin and cell differentiation.

TGF-alpha is present in sheep and ferret skin and may affect hair growth without directly stimulating cell proliferation.

A new system for classifying curly hair types using precise measurements can improve hair care products and cultural inclusion.

New methods to classify curly hair types were developed based on shape and strength.

Uncombable hair syndrome causes frizzy hair and can affect the nervous system, eyes, and ears, often co-occurring with other hair, skin, nail, and teeth conditions, and is linked to three specific gene mutations.

Human hair keratins can self-assemble and support cell growth, useful for biomedical applications.

The document concludes that understanding hair biology is key to treating hair disorders, with gene therapy showing potential as a future treatment.

We don't fully understand how sunlight damages different types of hair.