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Environmental and cosmetic factors, including heat, chemicals, and sun exposure, can cause hair loss and damage.

Hair growth is influenced by hormones and goes through different phases; androgens can both promote and inhibit hair growth depending on the body area.

Hair analysis is better than urine and blood for detecting past drug use.

Understanding normal hair growth and loss in children is key to diagnosing and treating hair disorders.

Hair elemental analysis could be useful for health and exposure assessment but requires more standardization and research.

The document explains hair growth and shedding, factors affecting it, and methods to evaluate hair loss, emphasizing the importance of skin biopsy for diagnosis.

The proteins transthyretin and megalin are more present in the growth phase of hair, suggesting they might affect hair health and growth.

Hair's resistance to wear varies by ethnicity and treatment, with less wear indicating stronger hair.

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.

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

More dermal papilla cells in hair follicles lead to larger, healthier hair, while fewer cells cause hair thinning and loss.

The document concludes that targeting 5α-reductase, the androgen receptor, and hair growth genes, along with using compounds with anti-androgenic properties, could lead to more effective hair loss treatments.

Hair dyes can change hair color temporarily or permanently but may cause side effects like skin reactions and hair damage.

Bleaching and combing damage hair's surface and mechanical properties.

Kojyl cinnamate ester derivatives can promote hair growth by increasing adiponectin production in fat tissues.

The "Punch Assay" can regenerate hair follicles efficiently in mice and has potential for human hair regeneration.

Dermoscopy shows that diffuse alopecia areata progresses through specific hair growth stages.

Skin and hair renewal is maintained by both fast and slow cycling stem cells, with hair regrowth primarily driven by specific stem cells in the hair follicle bulge. These cells can also help heal wounds and potentially treat hair loss.

Chemotherapy often causes hair loss, which usually grows back within 3 to 6 months, but there's no effective treatment to prevent it.

Hair, teeth, and mammary glands develop similarly at first but use different genes later.

Researchers developed a method to grow hair follicle cells for transplantation using a special chip.

The document concludes that the trichogram is a useful tool for diagnosing hair loss and suggests semi-organ cultures for practical trichological research.

Mice without certain skin proteins had abnormal skin and hair development.

Crossbreeding certain European cattle breeds may cause hair and physical issues in cattle.

Bald thigh syndrome in sighthounds is caused by structural defects in hair shafts due to downregulated genes and proteins.

The herbal shampoo made hair shinier, smoother, and softer without side effects.

The article concludes that the wool follicle is a valuable model for studying tissue interactions and has potential for genetic improvements in wool production.

Using neurohormones to control keratin can lead to new skin disease treatments.

Decreased IGF-1R expression may contribute to sacrococcygeal pilonidal sinus development.