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Amenorrhea, or the absence of periods, should be evaluated by age 15 or within five years of early breast development, and is most commonly caused by conditions like polycystic ovary syndrome and hypothalamic amenorrhea.

New treatments for hair loss may target specific pathways and generate new hair follicles.

The enzymes 5α-reductase and 3α/β-hydroxysteroid oxidoreductase help create brain-active substances from progesterone and testosterone, which could be used for treatment, but more research is needed to ensure their safety and effectiveness.

Carvone helps treat skin issues by reducing melanin and stopping harmful cell growth.

FP-1 is a key protein in rat hair growth, active only during the growth phase.

Targeting the protein Caveolin-1 might help treat a type of scarring hair loss called Frontal Fibrosing Alopecia.

Different proteins are linked to the varying thickness of sheep and goat hair types.

Brassica oleracea extract, glucosinlates, and sulforaphane can boost hair growth and might be used to treat hair loss.

The local environment is crucial for cell development in the tongue.

New tools show that in fish, NPY increases feeding and somatostatin decreases it.

Different hair follicles in the skin are innervated by unique combinations of mechanosensory neurons, crucial for touch sensation.

Lotion with fucoidan from brown seaweed improved skin and reduced allergy symptoms in mice with dermatitis.

Ancient DNA blocks are still present in human genomes, possibly due to advantages they provide.

High mTORC1 activity slows hair growth and causes it to lose color.

Hair follicle studies suggest that maintaining telomere length could help treat hair loss and graying, but it's uncertain if mouse results apply to humans.

New methods to test hair growth treatments have been developed.

Environmental pollutants can damage hair health and cause hair loss.

Gynostemma pentaphyllum and its component damulin B could help hair grow by activating certain cell pathways.

Iris germanica rhizome-derived exosomes help protect skin cells from oxidative stress and aging.

The document concludes that hair follicle regeneration involves various factors like stem cells, noncoding dsRNA, lymphatic vessels, growth factors, minoxidil, exosomes, and induced pluripotent stem cells.

Glutamic acid helps increase hair growth in mice.

TRPV3 could be a target for treating pain, skin disorders, and hair problems, but more research is needed to create effective drugs.

Hairless mammals have genetic changes in both their protein-coding and regulatory sequences related to hair.

Specific genes influence hair and cashmere growth in Laiwu black goats.

Testosterone significantly affects sexual desire in both men and women, but its impact on women is more complex and influenced by psychological factors.

Certain genes and pathways are linked to the production of finer and denser wool in Hetian sheep.

Neuroactive steroids show promise for treating mental and neurological disorders by targeting GABA_A receptors.

The type 3 IP3 receptor is important for controlling hair loss and growth.

Msx and Dlx genes are crucial for development, controlling cell behaviors like growth and differentiation through their roles as gene regulators.

Vitamin D receptor knockout mice have significant motor impairments but no cognitive deficits.