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Barn owls with smaller black spots have higher testosterone levels, which might be due to genetic effects on hormone regulation rather than hormone effects on coloration.

Ambras syndrome's genetic cause is unknown, as it isn't linked to androgen levels.

A blue Staffordshire Bull Terrier had hair loss due to color dilution alopecia, confirmed by tests, but no treatment was pursued.

A girl with excessive hair growth had a genetic change on chromosome 17 that reduced the activity of two genes linked to hair growth.

SLC24A5 shows a clear selective sweep, but no link to UV radiation intensity.

Only skin melanocytes, not other types, can color hair in mice.

Hair with more melanin resists weather damage better.

Innovative cosmetics could safely change hair color by targeting biological hair pigmentation processes.

Human skin and hair color variation is mainly due to melanin produced by a few genes, with melanin protecting against sun damage.

Sphynx cats are hairless and Devon Rex cats have curly hair due to specific genetic mutations.

Identical twins with a rare KRT 86 gene mutation both have the hair disorder monilethrix.

The CORIN gene variant causes the golden color in Siberian cats.

Hair restoration surgery can change the appearance of hair when examined with a special magnifying tool.

A specific gene mutation causes different hair defects in Indian monilethrix families.

B6.Cg-Tyr c−2J Hr hr /J mice have a stronger delayed sunburn reaction and are good for UV research.

A KRT71 mutation in Hereford cattle in Uruguay causes thin, curly hair and scaly skin.

A 6-year-old girl had both monilethrix and trichorrhexis nodosa, causing brittle hair, with minimal improvement from treatment.

Polarized dermoscopy is slightly better than nonpolarized for diagnosing hair disorders, with each method having its own strengths.

Chromosomal microarray analysis is important for diagnosing rare genetic variations and guiding treatment.

Monilethrix is a genetic hair disorder affecting hair shape, seen in two brothers.

Old C57BL/6 mice with unsynchronized hair cycles show less melanin in their spleens.

Poliosis causes white hair patches due to lack of melanin.

The document concludes that while white skin, nail, and mucosa diseases increase skin cancer risk, they are generally harmless, especially compared to darker pigmentation conditions.

Two siblings have a rare hair condition caused by a new genetic variant.