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As people age, their hair follicles produce less pigment, leading to gray and white hair, due to factors like reduced enzyme activity and damage to melanocyte DNA.

Cathepsin L is essential for normal hair growth and development.

Hair follicle melanocytes die during hair regression.

We need more research on human hair follicle pigmentation, not just mouse models.

Stress increases nerve fibers and immune cell activity in mouse skin, possibly worsening skin conditions.

Melatonin helps regulate hair growth and protects the hair follicle from stress.

Chemotherapy damages hair follicles, causing hair loss and other cellular changes.

Certain genes control the color of human hair by affecting pigment production.

Researchers developed a quick and easy way to get and grow cells from the base of human hair follicles.

Human skin cells produce proenkephalin, which changes with environmental factors and skin diseases.

Hair grays due to oxidative stress and fewer functioning melanocytes.

The document concludes that certain rats and mice are useful for studying hair loss in humans and testing treatments.

Group behavior therapy reduces hair-pulling symptoms more than supportive therapy but has limited long-term effectiveness.

The new assay can track and measure melanosome transfer between skin cells, confirming filopodia's role in this process.

Healthy mitochondria in skin cells are essential for proper hair growth and skin cell interaction in mice.

Hair follicle cells age faster and lose pigment due to less catalase, causing hair to turn gray.

Disruptions in hair follicle fibroblast dynamics can cause hair growth problems.

Hair diversity is influenced by complex genetics and environmental factors, requiring more research for practical solutions.

Hair melanocytes help the skin respond to stress and regulate hair pigmentation.

Different melanocyte types in hair follicles either survive or die during the catagen phase.

Different lab conditions and light treatment methods change how human skin cells respond to light therapy.

Photobiomodulation may help with hair growth and wound healing, but research is inconsistent and needs better quality studies.

Intermediate hair follicles are a better model for studying hair growth and testing hair loss treatments.

Scalp hair follicle culture has limits for testing minoxidil's hair growth effects.

P-cadherin is crucial for hair follicle pigmentation but not skin pigmentation.

MMP-9 is essential for proper hair canal formation.

The fuzzy gene is crucial for controlling hair growth cycles.

Male hormones cause different growth in identical human hair follicles due to their unique epigenetic characteristics.

Low levels of vitamin B12 and ferritin are linked to early hair graying.