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Testosterone is important for men's sexual function, may help some women's sexual desire, while other hormones and neurotransmitters also play complex roles in sexual behavior.

Lgr5 is a marker for active, self-renewing stem cells in the intestine and skin, important for tissue maintenance.

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

Scientists made working salivary glands in mice using bioengineered cells, which could help treat dry mouth.

Androgens can cause hair growth in some areas and hair loss on the scalp.

Men generally have more severe COVID-19 cases and higher death rates than women due to biological differences.

Asia has made significant progress in tissue engineering and regenerative medicine, but wider clinical use requires more development.

Finasteride may cause long-lasting sexual side effects.

Amenorrhea is relatively rare and initial testing should check FSH, TSH, and prolactin levels.

The circadian clock influences the behavior and regeneration of stem cells in the body.

S5αR inhibitors might help treat schizophrenia and other mental disorders but need more research.

5-alpha reductase inhibitors can cause sexual side effects like erectile dysfunction and reduced sexual desire, sometimes lasting after stopping the drug.

The document explains how the male reproductive system works, its role in making testosterone, and how conditions like obesity can disrupt it, leading to low testosterone and fertility issues.

Blocking BACE1 and BACE2 enzymes causes hair color loss in mice.

The research found how GPCR Class A Rhodopsin receptors are related and suggested possible substances they interact with.

Stem cell niches are adaptable and key for tissue maintenance and repair.

Wnt signaling is important for development and cell regulation but can cause diseases like cancer when not working properly.

Natural 5α-reduced glucocorticoids might be anti-inflammatory with fewer side effects than current options.

Some plants may help with hair growth and have fewer side effects than synthetic drugs, but more research is needed to confirm their effectiveness.

PFS and PSSD are similar conditions with persistent sexual dysfunction after stopping medication.

The document concludes that identifying the cause of amenorrhea is crucial for proper treatment.

5-alpha reductase inhibitors slightly increase the risk of sexual and mood side effects, and breast growth in men.

Amenorrhea is when a woman doesn't have periods, with primary amenorrhea starting by age 15 or within five years of breast development, and secondary amenorrhea when periods stop for three months. It affects 3-4% of women not pregnant, breastfeeding, or in menopause, mainly due to polycystic ovary syndrome, hypothalamic amenorrhea, hyperprolactinemia, and ovarian failure.

Meis1 is crucial for skin health and tumor development.

Parkinson's disease is linked to skin disorders and skin cells help in studying the disease.

Three specific proteins can turn adult skin cells into hair-growing cells, suggesting a new hair loss treatment.

The spiny mouse is a unique menstruating rodent that can help us understand menstruation and reproductive disorders.

The document concludes that understanding how adult stem and progenitor cells move is crucial for tissue repair and developing cell therapies.

A drug improved schizophrenia-like symptoms in stressed rats by changing brain steroid levels.

Finasteride can cause sexual problems and depression in young men.