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Human skin has multiple layers and functions, with key roles in protection, temperature control, and appearance.

AGA patients have fewer hairs and smaller follicles; T:V ratio above 4:1 may indicate AGA.

Bleaching hair removes its protective top layer and exposes more hydrophilic groups, changing its chemical surface and affecting how it interacts with products.

Patients with androgenetic alopecia have thinner subcutaneous fat layers in their frontal scalp compared to healthy individuals.

Microneedles with traditional Chinese medicine can help regrow hair in androgenic alopecia.

The nano-carrier makes etoposide safer and more effective against lung cancer.

The study found nine new hair protein genes in human hair follicles.

Aging skin shows thinner layers, fewer hair follicles, and new biomarkers like increased space between cells and smaller sebaceous glands.

Oral itraconazole effectively reaches and treats deep skin layers in guinea pigs.

The study concluded that people with Lichen Planopilaris have a more diverse scalp bacteria and different metabolic pathways compared to healthy individuals.

The skin's dermal layer contains true stem cells with diverse functions and interactions that need more research to fully understand.

Removing the outer skin layer increases drug absorption and offers non-invasive treatment options, with some methods allowing for quick skin recovery.

Hair growth is influenced by interactions between skin layers, growth factors, and hormones, but the exact mechanisms are not fully understood.

Skin stem cells maintain and repair the outer layer of skin, with some types being essential for healing wounds.

Researchers extracted tiny keratin filaments from human hair by unzipping its outer layer.

Skin spheroids with both outer and inner layers are key for regrowing skin patterns and hair.

Basal cell carcinoma mostly starts from cells in the upper skin layers, not hair follicle stem cells.

Different types of stem cells exist within individual skin layers, and they can adapt to damage, transplantation, or tumor growth. These cells are regulated by their environment and genetic factors. Tumor growth is driven by expanding, genetically altered cells, not long-lived mutant stem cells. There's evidence of cancer stem cells in skin tumors. Other cells, bacteria, and genetic factors help maintain balance and contribute to disease progression. A method for growing mini organs from single cells has been developed.

Women with PCOS have more body fat and thicker fat layers in certain abdominal areas than women without PCOS.

Sweat glands and hair follicles are structurally connected within a specific layer of skin fat.

Human body's immune cells are more common in the layer of fat just beneath the skin than in deeper fat layers.

Researchers found a genetic region that influences the number of coat layers in dogs.

The composite sponge helps heal diabetic wounds by reducing inflammation and promoting new blood vessel growth.

Nano-sized lipid particles increase dexamethasone's skin penetration and create a reservoir in the skin layers.

A new staining method shows a special area in the hair's skin layer with lots of proteoglycans.

A new keratin, hK6irs1, is found in all layers of the hair follicle's inner root sheath.

The enzyme type 1 5α-reductase is more active in the hair follicle's lower part than in the skin's outer layer.

Researchers created a potential skin substitute using a biodegradable mat that supports skin cell growth and layer formation.

The skin's basement membrane is specially designed to support different types of connections between skin layers and hair follicles.

Treating melasma in men is difficult, especially for the deeper skin layers, and may need more than just topical treatments.