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Graying hair is caused by changes in gene expression affecting cell functions.

Estrogens and androgens are crucial for male fertility.

Amlodipine impairs fertility in male rats by affecting sperm and testicular structure.

Mechanical forces are crucial for hair regeneration in skin organoids.

Disulfide bonds affect the melting behavior of hair's crystalline structure, but hair retains some stability even after these bonds are broken.

The digital system for measuring melasma shows promise but needs more development for better accuracy and automation.

Calcium is crucial for skin development and healing.

Certain hairstyles can cause scalp diseases, smoking is linked to hair loss, 5% minoxidil foam is effective for hair loss treatment, and various factors influence wound healing and hair growth.

Local positive feedback helps shape root hair cells by stabilizing growth sites.

Popliteal Artery Entrapment Syndrome (PAES) is a rare but possible cause of leg pain during walking, even in untrained women.

The vitamin D receptor has many roles in the body beyond managing calcium, affecting the immune system, hair growth, muscles, fat, bone marrow, and cancer cells.

Human scalp hair follicles can produce and respond to several hormones, affecting hair growth and pigmentation.

Genetic manipulations that extend lifespan in mice may not work as effectively in humans.

Vitamin D is important for skin cell growth and health, and its active form and receptor play key roles in skin and hair processes.

The 16th-century mummy's hair was well-preserved due to a calcium coating.

Mineral deposits form in hair follicles after skin injury, faster in rats given DHT.

Active vitamin D3 might protect hair follicles from radiation damage.

A young woman had a rare scalp tumor usually found in older women.

Researchers found new hair and nail genes, how hair reacts to UV, differences in white and pigmented hair growth, nerve changes in alopecia, treatments for baldness and alopecia, a toenail condition linked to a genetic disorder, and that nail fungus is more common in people with psoriasis.

Dogs absorb zinc better from amino acid-chelated sources than inorganic ones.

Zinc is absorbed better in dogs when supplied as a chelate with amino acids.

1 alpha,25-dihydroxy-vitamin D3 and calcipotriol speed up cell differentiation in hair follicles.

Cyclosporin A and FK506 can start new hair growth in mice, but ascomycin and rapamycin cannot.

A lab model of human skin was created to study skin tumor promoters without using actual human skin.

People need different amounts of biotin based on age and it's important for health, with many foods providing enough.

EGF and TGF-α help maintain hair cell cultures, but TGF-β1 stops their growth.

Mouse hair element patterns vary, making it unreliable for tracking time.

Biotin is important for metabolism, with specific daily intake recommendations, and deficiency can cause health problems.

The document corrects errors in previous articles, including a reversed term, updated subject weights, hair count data, and reference numbering.

Hair treatments can damage hair by changing its chemical content.