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The document describes a woman with familial Parkinson's disease due to a genetic mutation, showing severe symptoms and poor response to treatment, and suggests finasteride may help reduce symptoms in Tourette syndrome.

The research concluded that selection significantly shaped the genetic variation of the X chromosome, with certain regions affected by past selective events.

Testosterone therapy may slightly improve sexual function in postmenopausal women, but its long-term safety is unknown.

Men with common hair loss may have a higher risk of heart disease and diabetes, and should be checked for these conditions.

Human hair keratin fibers have a detailed nano-scale structure that changes with different conditions.

Tight hairstyles, especially on chemically treated hair, can cause reversible hair loss if caught early but may become permanent if not addressed.

Some psychiatric medications can cause reversible hair loss.

Testing for CAG repeat polymorphism in the androgen receptor gene is not currently recommended for managing hypogonadism.

Diagnosing hair loss disorders needs clinical, dermoscopic, and histological differences, and checking menstrual cycle, weight changes, drug therapy, and nail changes.

Finasteride may help some women with hair loss, but better options exist.