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A boy's hair that was frizzy and hard to comb returned to normal after 9 months, possibly due to genetic factors.

Human hair varies in structure based on curl type, with high curl hair showing the most differences.

Alopecia areata may appear differently depending on the individual's type of hair loss and scalp condition.

Msx2-deficient mice experience irregular hair growth and loss due to disrupted hair cycle phases.

The document concludes that hair biology is complex and there are still unanswered questions about hair loss and follicle changes.

Hair curliness is due to uneven distribution of different cortices within the hair fiber.

Segmented hair color changes can indicate active alopecia areata.

The study concluded that genetic mutations affect human hair diseases and identified key genes and pathways involved in hair growth and cycling.

Curly and straight hair differ in how their internal fibers are arranged.

Hair diversity is influenced by complex genetics and environmental factors, requiring more research for practical solutions.

Alopecia areata incognita causes widespread hair loss without patches and needs a scalp biopsy for diagnosis.

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 that pili bifurcati causes hair to intermittently split into two branches, each with its own outer layer.

A mutation in the KRT74 gene causes woolly hair by affecting hair texture.

An 8-year-old girl has a rare genetic disorder causing complete, irreversible hair loss and skin bumps.

Two siblings have a rare genetic condition causing curly, coarse hair.

Hair's internal fibers are arranged in a pattern that doesn't let much water in, and treatments like oils and heat change how much water hair can absorb.

A 6-year-old girl's inability to grow her hair long was due to Loose Anagen Hair Syndrome, which causes hair to shed easily and may improve with age.

Androgens may worsen a natural hair resting phase, possibly leading to hair loss.

The molecular mechanisms controlling hair growth phases are not fully understood yet.

Human hair can be classified into eight types based on physical features, not ethnicity.

Loose anagen hair can appear at any age and may improve over time.

Acquired alopecia is hair loss that can be reversible or irreversible, depending on whether the hair follicle is destroyed.

A man with Woolly Hair Syndrome had very curly, fragile hair, and doctors used a special scalp examination to diagnose him without invasive tests.

Bubble hair deformity may be caused by hair shaft trauma and can improve with gentle hair care.

Certain herbs may help treat hair loss by extending hair growth phases.

Mother and son diagnosed with a rare genetic hair loss condition with no effective treatment.

Hair has unevenly distributed proteins and lipids, with lipids mainly in the cuticle and proteins in the cortex and medulla.

Over half of the children had abnormal hair under a microscope, with many having genetic hair conditions.