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Different populations have distinct hair structures related to their ancestry.

Human hair has a new region with ordered filaments and the cuticle contains β-keratin sheets.

UV radiation and visible light can damage hair, but there are ways to protect it.

Partial hair follicle extraction can effectively double the number of hair follicles for transplants, with most surviving and growing normally after a year.

The best hair transplant method depends on the desired look; faster techniques may not give better results or save money.

Laser hair transplantation can be effective but should be limited to small areas and requires more training to ensure safety and effectiveness.

Punch grafting treats vitiligo faster but can cause a cobblestone look, while follicular hair transplantation is slower but looks better and has no side effects.

The method can measure vitamin B3 levels in human hair accurately.

Transplanted hair follicles can change and adapt to new areas of the body, with the immune system possibly playing a role in this adjustment.

3% hydrogen peroxide does not harm hair graft survival compared to saline.

Hair stiffness increased by 13.2% after caffeine treatment, validating the Stiffness-Angle Law as an effective measurement method.

The authors' 10-year experience shows that a personalized approach to hair restoration surgery, using various techniques, leads to natural results and high patient satisfaction.

Hair transplant megasessions are safe up to 1500 grafts but larger sessions have more risks and challenges.

Fungal infections can cause hair loss in lupus patients and should be considered even if rare.

Many patients experienced hair loss after COVID-19, with women affected more, starting on average 49 days post-infection.

Neonate scalp hair is thinner, lacks a medulla, and has smaller follicles compared to adult hair.

3% hydrogen peroxide does not reduce hair graft survival compared to saline.

Scalp reduction gives the most natural result for significant crown baldness, despite potential complications, and a systematic approach to surgical hair restoration results in few complications and high graft survival.

Hair transplant is effective for treating hair loss caused by radiation and improves patients' quality of life.

The Hair Implanter Pen increases speed and is gentle on grafts, with users mastering it after a few tries.

Various techniques and tools for hair restoration were presented in 1998, including a mathematical model for donor area, use of lasers in surgery, methods for controlling grafted hair direction, and ways to increase graft yield. Satisfaction rates were around 39%, and studies showed trauma and dehydration can damage hair follicles.

Dermatoscopy is useful for identifying different hair and scalp conditions and can reduce the need for biopsies.

FPHL affects hair density and diameter, causing visible hair loss in older women.

The Multi-Organ-Chip improves the growth and quality of skin and hair in the lab, potentially replacing animal testing.

Hair follicles significantly increase the speed and amount of caffeine absorbed through the skin.

Green tea component EGCG could potentially promote human hair growth.

The document concludes that hair is complex, with a detailed growth cycle, structure, and clinical importance, affecting various scientific and medical fields.

Eating the right nutrients can improve hair health, but taking extra supplements usually doesn't help unless you have a deficiency.

Grafted rodent and human cells can regenerate hair follicles, but efficiency decreases with age.

Notch/CSL signaling controls hair follicle differentiation through Wnt5a and FoxN1.