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miR-22, a type of microRNA, controls hair growth and its overproduction can cause hair loss, while its absence can speed up hair growth.

The document concludes that mouse models are crucial for studying hair biology and that all mutant mice may have hair growth abnormalities that require detailed analysis to identify.

Mutations in the hairless gene in mice affect its expression and lead to a range of developmental issues in multiple tissues.

Prolactin may play a significant role in skin and hair health and could be a target for treating skin and hair disorders.

The document explains hair growth and shedding, factors affecting it, and methods to evaluate hair loss, emphasizing the importance of skin biopsy for diagnosis.

The control system for hair growth cycles is not well understood and needs more research.

Possible new treatments for common hair loss include drugs, stem cells, and improved transplants.

The protein StAR is found in 17 different organs and can affect hair loss and brain functions, but its full role is not yet fully understood.

Androgens prevent hair growth by changing Wnt signals in cells.

The document concludes that more research is needed to understand excessive hair growth in women with normal hormone levels and regular ovulation.