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

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

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

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.

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.

LEF1 is essential for the development of airway glands and is regulated by the Wnt/ß-catenin pathway.

Exosomes from umbilical cord cells fix hearing loss and damaged ear hair cells in mice.

Healthcare claims databases can help monitor drug safety, but may report adverse events differently than direct surveillance.

The document concludes that stem cell inactivity is actively controlled and important for tissue repair and balance.

PNKP is essential for keeping adult mouse progenitor cells healthy and growing normally.

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

Humans have limited regenerative abilities, but new evidence shows the adult brain and heart can regenerate, and future treatments may improve this by mimicking stem cell environments.

Nanostructured lipid carriers are effective for treating hyperpigmentation in women aged 30-40.

Gene therapy in mice increased lifespan and improved health without causing cancer.

A 19-year-old male with delayed puberty was successfully treated for a condition that prevents normal hormone production.

Maintaining DNA integrity in stem cells is crucial to prevent aging and cancer.

The document concludes that various skin conditions have specific characteristics and treatments, and highlights the importance of vitamin D in managing these dermatological issues.

Activin A and follistatin control when ear hair cells form in mice.

Activin A promotes ear hair cell development, while follistatin delays it.

Probiotics show promise for health benefits but need more research to understand how they work.

Mice with human fetal thymic tissue and stem cells developed symptoms similar to chronic graft-versus-host disease.

Sox21 is crucial for tooth development and enamel formation by preventing cells from changing into a different type.

Loss of Msx2 function causes eye development issues similar to Peters anomaly.

Stem cell therapy is promising for treating various health conditions, but more research is needed to understand its full potential and address challenges.

Clausena anisata may be effective in treating acne due to its ability to fight bacteria, reduce inflammation, and possibly lower sebum production.

The skin systems of jawed vertebrates evolved diverse appendages like hair and scales from a common structure over 420 million years ago.

Certain genes are linked to the quality of cashmere in goats.

Hair follicle stem cells can help treat ulcerative colitis in mice by releasing beneficial exosomes.

Light therapy on the brain shows promise for treating brain diseases and improving brain function.