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Testosterone is crucial for development, growth, and various body functions in mammals.

The document concludes that while some organisms can regenerate body parts, mammals generally cannot, and cancer progression is complex, involving mutations rather than a strict stem cell hierarchy.

Cross-linked hyaluronic acid injections effectively rejuvenated upper eyelids, giving a youthful look for over a year.

Galea fixation is a safe and effective way to remove bald scalp with minimal scarring and reduced stretch-back.

Hair follicle development is controlled by interactions between skin tissues and specific molecular signals.

Fat tissue-derived cells show promise for repairing body tissues, but more research and regulation are needed for safe use.

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

Periodontal ligament stem cells show promise for regrowing tissues but require more research for safe, effective use.

Fat-derived stem cells show promise for skin repair and reducing aging signs but need more research for consistent results.

Smart biomaterials that guide tissue repair are key for future medical treatments.

Mesenchymal stem cells show potential for skin healing and anti-aging, but more research is needed for safe use, especially regarding stem cells from induced pluripotent sources.

Kennedy's disease leads to muscle weakness and sensory issues, has no cure but manageable symptoms, and future treatments look promising.

Using minoxidil on dogs can cause serious cardiovascular damage, including arterial injury and hemorrhagic lesions.

Environmental factors at different levels control hair stem cell activity, which could lead to new hair growth and alopecia treatments.

Aconiti Ciliare Tuber extract may help hair grow by activating a specific cell signaling pathway.

Hormones and neuroendocrine factors control hair growth and color, and more research could lead to new hair treatment options.

Tiny particles called extracellular vesicles could help with skin healing and hair growth, but more research is needed.

Madarosis is the loss of eyelashes and eyebrows due to various health issues and requires thorough examination to diagnose and treat the underlying cause.

Isoproterenol helps hair follicle stem cells turn into beating heart muscle cells.

Cashmere and milk goats have different hair growth cycles and gene expressions, which could help improve wool production.

Gene network oscillations inside hair stem cells are key for hair growth regulation and could help treat hair loss.

Epidermal stem cells have various roles in skin beyond just maintenance, including forming specialized structures and aiding in skin repair and regeneration.

α-Tocopheryl acetate is well absorbed through healthy skin.

The document concludes that inhalation of oxygen and sumatriptan injections are primary for cluster headaches, indomethacin for paroxysmal hemicrania, and lidocaine and lamotrigine for SUNCT, but SUNCT often resists treatment.

Telocytes in the scalp may help with skin regeneration and maintenance.

Dutasteride caused more penile tissue changes than finasteride, possibly increasing erectile dysfunction risk.

Medications for enlarged prostate can cause sexual side effects like reduced libido, erectile dysfunction, and ejaculatory problems.

Use shallow cuts, small tissue removal, careful suturing, and keep the area moist to reduce scarring in hair transplants.

Current therapies cannot fully regenerate adult skin without scars; more research is needed for scar-free healing.

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