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Hair loss in Androgenetic alopecia (AGA) is due to altered cell sensitivity to hormones, not increased hormone levels. Hair growth periods shorten over time, causing hair to become thinner and shorter. This is linked to miscommunication between cell pathways in hair follicles. There's also a change in gene expression related to blood vessels and cell growth in balding hair follicles. The exact molecular causes of AGA are still unclear.

Rac1 is essential for proper hair structure and color.

The "Two-Cell Assemblage" assay is a new, simple method to identify substances that may promote hair growth.

Scientists created three types of structures to help regrow hair follicles, and all showed promising results for hair regeneration.

The study found that two enzymes linked to hair loss are located in different parts of the scalp, supporting a common treatment's effectiveness.

Stabilizing HIF1A in hair follicles increases glycolysis, which may help reduce oxidative stress and support hair growth.

Hair follicles grow hair and release it through the skin.

VDUP1 is found in skin and hair follicles, interacts with sciellin, and may help regulate skin cell differentiation.

A gene mutation causes early keratinocyte maturation leading to hair loss in Olmsted syndrome.

The Gsdma3 gene is essential for normal hair development in mice.

Keratin 26 affects cashmere goat hair growth and is influenced by various treatments.

Only a few hair-specific keratins are linked to inherited hair disorders.

Trichohyalin, a hair follicle protein, has a part with repeating patterns of 23 amino acids.

Scientists are still unsure what triggers the immune system to attack hair follicles in Alopecia areata.

Hair follicles can regenerate after radiation damage but not during a specific growth phase.

Sheep hair follicle cells can grow a lot but need the dermal papilla to do so.

PAD3 plays a key role in hair and skin protein structure and may be linked to skin diseases.

The absence of functional sebaceous glands causes hair follicle destruction and scarring alopecia.

Certain cells from hair follicles can create new hair and contribute to hair growth when implanted in mice.

CD90 is present on specific cells in dog hair follicles.

The study found that stem cells and neutrophils are important for regenerating hair follicle structures in mice.

The research found that postmortem root bands in hair are likely caused by the breakdown of a specific part of the hair's inner structure after death.

Modified stem cells that overexpress a specific protein can improve hair growth and reduce hair abnormalities in mice.

Human hair follicle dermal cells can effectively replace other cells in engineered skin.

The hair follicle's connective tissue is a key source of a certain collagen in human scalp skin.

OCT binds strongly to hair sheath cells and may affect skin and hair growth with fewer side effects than vitamin D3.

Scientists created stem cells that can grow hair and skin.

All-trans retinoic acid causes hair loss by increasing TGF-β2 in hair follicle cells.

Hexi cashmere goats' hair growth varies by stage, with Hoxc13 linked to hair activity.

The document concludes that accurate diagnosis of different types of hair loss requires careful examination of hair and scalp tissue, considering both clinical and microscopic features.