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Excess vitamin A changes skin and hair follicle development and affects polysaccharide distribution.

Hair follicle cells need complex interactions to fully differentiate.

Some drugs can cause hair loss and skin issues.

Trichohyalin is found in non-hair tissues and works with filaggrin in certain skin areas and conditions.

The trichohyalin gene is located at chromosomal region 1q21 with other skin-related protein genes.

Benign epithelial tumors in dogs don't spread or become cancerous.

Porcine and human pilosebaceous units are very similar.

The skin protects the body and is constantly renewed by stem cells; disruptions can lead to cancer.

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

Involucrin helps strengthen the inner parts of human hair.

Grafted rodent and human cells can regenerate hair follicles, but efficiency decreases with age.

Llamas often have skin issues like mange, bacterial infections, and allergies, with some treatable by zinc.

ABCG2 protein marks stem-like skin cells in human epidermis.

Adult skin cell-based early-stage skin substitutes improve wound healing and hair growth in mice.

Sheep wool follicles absorb different amino acids at various rates and locations, which could affect wool growth based on diet and genetics.

Skin stem cells can help improve skin repair and regeneration.

Skin cells and certain hair follicle areas produce hemoglobin, which may help protect against oxidative stress like UV damage.

A new strain of bacteria from the human skin can help prevent hair loss.

Skin stem cells are crucial for maintaining and repairing the skin and hair, using a complex mix of signals to do so.

Apoptosis is essential for human skin development and forming a functional epidermis.

The Apc gene is crucial for normal skin and thymus development.

Keratin expression reflects cell organization and differentiation, not causes it.

The document concludes that while significant progress has been made in understanding skin biology and stem cells, more research is needed to fully understand their interactions with their environment.

Changes in keratin affect skin health and can lead to skin disorders like blistering diseases and psoriasis.

Different dog breeds have varying skin thickness and protein expression in their skin.

Adult stem cells with Tp63 can form hair and skin cells when placed in new skin, showing they have hidden abilities for skin repair.

Environmental cues can change the fate and function of epithelial cells, with potential for cell therapy.

EpiLife® media and younger donor age improve artificial skin model quality.

Azelaic acid is effective for treating rosacea, acne, and melasma.

Hairless protein and putrescine regulate each other, affecting hair growth and skin balance.