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Hair and nail cells share similar proteins, indicating a common differentiation pathway.

Zolpidem shows up in hair from the top back of the head after one dose and fades over time, suggesting it gets into hair through blood and sweat.

The document explains hair and nail biology, common hair loss conditions and treatments, oral and genital skin diseases, and the risks and treatments associated with squamous cell carcinoma.

Chemical treatments severely damage hair cuticles, especially in previously treated hair.

Scalp hair characteristics vary across different regions of India and can help identify a person's origin.

S100A4 and S100A6 proteins may activate stem cells for hair follicle regeneration and could be potential targets for hair loss treatments.

Human hair proteins vary by individual, body site, and ethnicity, useful for forensics.

Some mutant mice have hair with abnormal cross-linking, mainly in the cuticle, not affecting other hair parts.

Surfactants damage hair, but sealing the cuticle can prevent this.

Abnormal cuticle and hair shaft medulla cause hair loss in androgenetic alopecia; sonography helps diagnose and manage it.

Atomic Force Microscopy is a more accurate way to assess hair damage and the effect of cosmetic treatments.

Researchers found genes for cysteine-rich proteins that form the protective layer of hair in humans and sheep.

A gene variant increases the risk of a type of hair loss by affecting hair protein production.

Keratin-associated proteins are part of the developing hair fiber cuticle.

Eyelash curvature is linked to the thickness of the cuticle layer at the root.

The hair cuticle is made of tough proteins that protect the hair, but more research is needed to fully understand its structure.

The document concludes that treatments like oral anti-androgens, minoxidil, and topical spironolactone can be effective for hair loss in men and women.

Human hair's ability to get wet is complex and can change with treatments, damage, and environment.

Hair growth is controlled by specific gene clusters and proteins, and cysteine affects hair gene expression in sheep.

Different populations have distinct hair structures related to their ancestry.

Modified keratin binds better to hair, especially bleached hair.

Hair from people with seborrheic dermatitis is thicker scaled, more damaged, and thinner than healthy hair, and atomic force microscopy can help monitor the condition.

The review highlights the importance of stem cells in hair health and suggests new treatment strategies for hair loss conditions.

Red fox, golden jackal, and gray wolf hairs have similar features but differ in length, thickness, and inner structure.

Hair care products used for 4 weeks made hair smoother.

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

Microfibrils are key for permanent waves, and hydrolyzed keratin improves wave formation and hair condition.

Papain and bisulfite break down human hair by dissolving parts of it.

A second domain of high sulfur KAP genes on chromosome 21q23 is crucial for hair structure.

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