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The hair follicle dermal sheath is essential for hair shedding and needs to communicate with the outer root sheath for normal hair growth cycles.

BMP signaling controls hair growth and skin color.

Hair loss in lupus patients indicates higher disease activity.

Hormone levels in hair change during pregnancy, with progesterone increasing significantly compared to non-pregnant women.

Testosterone increases hair testosterone levels, stress raises hair cortisol, and relationship status affects hormone levels.

Beard and scalp hair cells have different gene expressions, which may affect beard growth characteristics.

The study found that balding scalps have more thin hairs and larger oil glands, which might contribute to skin conditions related to hair loss.

Hair restoration surgeons must understand the differences between CTE and FPHL for accurate diagnosis and treatment.

Dermatologists can accurately detect smaller differences in hair density than previously thought.

Scalp fungi and sebum differences may affect hair loss in men.

Mothers have more hair proteins than their children, with age-related differences in protein patterns, and some proteins in hair could indicate early childhood development.

Beard cells, unlike scalp cells, produce growth factors in response to testosterone, which may explain differences in hair growth.

The gene SDR5A1 is found in scalp hair of both hirsute and normal individuals, but it does not explain differences in hair growth.

People respond differently to hair loss treatment with PRP because of individual differences in growth factors from platelets.

Lentiginous melanoma is most common on the face, especially the nose, cheek, and pre-auricular areas, with men more likely to have it on the scalp, ears, upper back, and trapezius, and women on the cheek and anterior arm. Sun damage is a key factor in its formation.

SFRP2 and PTGDS may be key factors in female hair loss.

African American women report more hair issues and use different hair care practices than Caucasian women, and have different hair and scalp characteristics.

The scalp microbiome is more diverse and may be more important in hair loss than the gut microbiome.

Human hair proteins vary by individual, body site, and ethnicity, useful for forensics.

Alopecia areata patients have more Propionibacterium acnes and less Staphylococcus epidermidis on their scalps.

Where melanoma is on the body affects survival chances; melanomas on the back of the head are worse, while those on thighs and arms are less severe, and more sun exposure might improve survival.

Certain genes are more active in baby scalp cells and can help grow hair when added to adult mouse skin cells.

The scalp has more diverse bacteria, while hair has more bacteria and unique types.

Scalp hair grows at 0.37 mm/day, forearm hair at 0.18 mm/day, and thigh hair at 0.30 mm/day, with no significant differences found in people with certain hair conditions.

The study found specific hair and scalp patterns for different types of hair loss in Koreans, noting racial differences affect diagnosis.

Hair area varies with age and sex, but hair index and medullary index do not.

Hair strength is similar across different scalp areas, and not affected by age, gender, or hair thickness.

MRI reveals thinner scalps and smaller hair follicles in people with androgenetic alopecia.

Hair proteins in preschool children and their mothers could indicate developmental changes and health status.

Scalp skin barrier affects hair loss; personalized treatments needed.