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Chemical and physical treatments like bleaching, dyeing, and UV radiation damage both Caucasian and Afro-ethnic hair.

Future hair cosmetics will be safer and more effective.

Tight hairstyles, especially on chemically treated hair, can cause reversible hair loss if caught early but may become permanent if not addressed.

Different sizes of keratin peptides can strengthen hair, with smaller ones possibly increasing volume and larger ones repairing damage.

Alopecia areata caused a boy's hair to regrow straight instead of curly, but the exact reason is unknown.

The editor suggests removing "race" and "ethnicity" from dermatology and creating tools to objectively assess skin color and hair texture.

Different human traits like skin color and hair type vary between populations due to genetic adaptations to the environment.

The skin-responsive device improved beard and body hair transplant success and increased surgeons' willingness to perform the procedure.

Afro-textured hair needs personalized care due to its unique genetic traits.

I'm sorry, but I can't provide a summary without the content of the document.

Genetic differences between young and old Tan sheep explain why their fleece changes from curly to straight as they age.

DNA variants can predict male pattern baldness, with higher risk scores increasing baldness likelihood.

Curly hair breaks more easily, especially with chemical treatments, but simpler grooming reduces breakage.

Proteins like BSA and keratin can effectively style hair and protect it, offering eco-friendly alternatives to chemical products.

Different ethnicities and treatments affect human hair strength and structure.

Valproate can cause hair loss and changes in hair appearance, but may help regrow hair when applied topically.

UV exposure reduced hair shine in mice, but minoxidil helped restore it.

Dr. Bernard Cohen created a new system to classify hair loss using numbers and a detailed scalp map.

High glycine–tyrosine keratin-associated proteins help make hair strong and maintain its shape.

The genes KRT25 and SP6 affect curly hair in horses, with KRT25 also causing hair loss. If both genes are mutated, the horse gets curly hair and hair loss. KRT25 can hide the effect of SP6.

Human hair, despite its different types, shares common traits that affect its structure and response to treatments.

Valproic acid may cause temporary hair changes like loss or thinning in children.

A 17-year-old developed woolly hair nevus in adolescence, which is unusual, and over time the hair darkened and straightened slightly, but microscopic changes persisted.

The document concludes that accurate diagnosis of hair disorders is crucial and requires a range of diagnostic methods.

Hair analysis for drugs needs a better understanding of how drugs enter hair, considering factors like hair structure and pigmentation.

Higher scalp elasticity leads to wider scars after hair transplantation; a new method to measure elasticity may help predict scar size.

Researchers found a genetic region that influences the number of coat layers in dogs.

Valproic acid can cause reversible hair curling and persistent hair thinning.

Chemotherapy patients don't all lose their hair due to factors like hair growth rates, age, genetics, and the type of drugs used.

Keratin-associated proteins have ancient origins and were used for different purposes before being adapted for hair in mammals.