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Testosterone and dihydrotestosterone affect hair growth, and new techniques like the folliculogram help study it, but fully understanding hair growth is still complex.

TGF-β2 plays a key role in human hair growth and development.

Hair follicle regeneration possible, more research needed.

Growing hair follicles have high mitochondrial activity and ROS in specific regions, aiding hair formation.

Laser hair reduction near the eyebrows can cause serious eye injuries even with safety measures.

Loose anagen hair syndrome is caused by structural abnormalities in the hair follicle's inner root sheath.

Nd:YAG laser can reduce hair with multiple treatments, but permanent removal isn't guaranteed.

Both immature and mature fat cells are important for hair growth cycles, with immature cells promoting growth and mature cells possibly inhibiting it.

Oral zinc sulphate reduces dark hair color in mice.

The study found no common cause for a girl's crystalline cataract and uncombable hair, suggesting their co-occurrence might be coincidental.

Scalp hair grows at 0.37 mm/day, forearm hair at 0.18 mm/day, and thigh hair at 0.30 mm/day, with no significant differences found in people with certain hair conditions.

Loose Anagen Syndrome causes easy-to-pull, thin hair, mainly in young girls, and improves with age.

Light microscopy is useful for diagnosing different hair disorders.

Aging scalp skin contributes to hair aging and loss, and more research is needed to develop better hair loss treatments.

Using polyethylenimine-DNA to deliver the hTERT gene can stimulate hair growth and may be useful in treating hair loss, but there could be potential cancer risks.

Light scatters differently from elliptical hair fibers than from circular ones, and a new model better predicts this behavior, especially for shiny highlights.

People with X-linked hypohidrotic ectodermal dysplasia have no sweat ducts and less, thinner hair.

Hair microscopy is useful for diagnosing certain hair loss conditions but has limitations and must be interpreted carefully.

Boxer and Labrador dogs' hair growth is affected by the tropical climate, but Schnauzers' is not.

Home-use lasers and IPL devices are unlikely to directly cause paradoxical hair growth; it may be linked to inflammation or hormonal issues.

The document concludes that periocular hair disorders have various causes and treatments, and proper evaluation by specialists is important for management and prognosis.

The document concludes that various childhood hair and nail disorders exist, some may improve on their own, and advances in genetics and immunology could enhance treatment and counseling.

The conclusion is that effectively treating hair disorders is difficult due to the complex factors affecting hair growth and more research is needed to improve treatments.

Human hair provides more UV protection when aligned and at higher angles, but the scalp still gets UV exposure.

Certain micronutrients may improve hair and nail health, but more research is needed to confirm their benefits.

The document concludes that proper diagnosis and treatment of hair shaft disorders require understanding their unique causes and avoiding hair-damaging practices.

The most common cause of hair loss in children is tinea capitis, followed by alopecia areata and telogen effluvium.

The document concludes that scalp conditions have various causes and can present in many different ways.

Modern hair restoration techniques can effectively treat hair loss and provide natural-looking results.

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