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Mice without the vitamin D receptor have bone issues and other health problems, suggesting vitamin D is important for preventing various diseases in humans.

Epithelial stem cells are crucial for tissue renewal and repair, and understanding them could improve treatments for damage and cancer.

Melatonin affects many body functions beyond sleep by interacting with specific receptors in various tissues.

The hypothesis suggests that PCOS may start early in life due to genetic and environmental factors, influencing future reproductive and metabolic problems.

Targeting colon cancer stem cells might lead to better treatment results.

Childhood obesity is rising globally due to various factors, and early prevention and healthy lifestyle changes are crucial.

Alopecia areata, a common autoimmune hair loss condition, often runs in families.

Certain proteins, Lgr5 and Lgr6, are important markers of adult stem cells and are involved in tissue repair and cancer development.

Alopecia areata is an autoimmune condition causing hair loss, influenced by genetics, stress, and diet, and may be prevented by a high soy oil diet.

Chemicals and body size might change when puberty starts and progresses, but more research is needed to confirm this.

Stem cell offspring help control their parent stem cells, affecting tissue health, healing, and cancer.

TGF-β is crucial for tissue repair and can cause diseases if not properly regulated.

Melatonin may help with sleep issues, depression, and cancer, but more research is needed.

Guidelines suggest various treatments for alopecia areata, but leaving it untreated is also an option as 80% cases may recover on their own.

The document concludes that the 5 alpha-reductase enzymes are important in steroid metabolism and related to various human diseases, with inhibitors used to treat conditions like male pattern baldness and prostate issues.

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

Dermoscopy helps diagnose and manage alopecia areata by showing specific hair changes.

The hedgehog signaling pathway is crucial for hair growth but not for the initial creation of hair follicles.

Biotinidase deficiency has various symptoms and can be treated with biotin supplements.

The 2003 guidelines suggest that while some treatments can regrow hair in alopecia areata, none alter the disease's progression, and wigs may be the best option for extensive hair loss.

Erectile dysfunction is increasingly common in men under 40, with many physical and psychological causes, and various treatment options available.

Demodicosis is common and often missed, needing more recognition and treatment in skin care.

Male hormones, particularly DHT, are linked to male pattern hair loss, and treatments like finasteride can help, but they don't work for postmenopausal women's hair loss, which may have different causes.

Estrogens significantly influence hair growth by interacting with receptors in hair follicles and may help regulate the hair growth cycle.

Dermatoscopy and videodermatoscopy are useful for diagnosing and monitoring various skin, hair, and nail conditions.

Too much androgen can cause hair loss; finasteride may help.

TGF-β signaling is crucial for stem cell maintenance, differentiation, and has implications for cancer treatment.

Skin grafts on mice can cause an immune response leading to hair loss, useful for studying human hair loss conditions.

The document concludes that understanding hair structure is key to diagnosing hair abnormalities and recommends gentle hair care for management.

Stem cell plasticity is crucial for wound healing but can also contribute to cancer development.