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Human hair is unique and important for understanding human evolution and identity.

Fish teeth and taste bud densities are linked and can change between types due to shared genetic and molecular factors.

Men are getting more beard transplants to look better and follow fashion trends.

Low androgen levels might delay prostate cancer but could lead to more aggressive, therapy-resistant cancers.

Cetaceans lost hair due to changes in the Hr and FGF5 genes.

Caspase-14 is important for skin and hair development in all mammals.

The document concludes that understanding health requires considering evolutionary perspectives on reproductive fitness, and recognizing the complexity of factors like diet, testosterone, and sexual orientation.

Humans can accurately guess age from faces, with women being slightly better at it, and age perception is linked to evolutionary factors.

PCOS may have evolved as an advantage in past environments with food scarcity.

The conclusion suggests that PCOS may persist due to genetic traits that, while harmful for female fertility, could have provided survival and reproductive benefits to males.

Redheaded people have higher levels of a vitamin D precursor, suggesting red hair may be an adaptation for better vitamin D synthesis in areas with less sunlight.

Redheaded people may have evolved to efficiently make vitamin D in areas with less sunlight.

Pangolins have lost some skin-related genes, but kept others, showing complex skin evolution.

The conclusion is that grasping how cells determine their roles through evolution is key, with expected progress from new research models and genome editing.

The research identified various cell types in mouse and human teeth, which could help in developing dental regenerative treatments.

Hairless mammals have genetic changes in both their protein-coding and regulatory sequences related to hair.

Different species use the same genes for tooth regeneration.

Hair keratins evolved from ancient proteins, diversifying through gene changes, crucial for forming claws and later hair in mammals.

Hair and wool have diverse keratins and keratin-associated proteins.

The research concluded that selection significantly shaped the genetic variation of the X chromosome, with certain regions affected by past selective events.

A man's scalp infection, mistaken for bacterial, was actually a rare fungal infection treated successfully with antifungal medication.

Hair follicles in the back of the rosette fancy mouse have reversed orientations due to a gene mutation.

Genes related to keratin, skin cell differentiation, and immune functions are key in hedgehog skin and spine development.

The study found that certain genes are important for hedgehog skin appendage development and immunity, with spines possibly evolving for protection and infection resistance.

Adding hyaluronic acid helps create larger artificial hair follicles in the lab.

Researchers found genes that control hair color and growth change before the visible coat color changes in snowshoe hares.

Coating surfaces with human hair keratin improves the growth and consistency of important stem cells for medical use.

Cat color patterns are determined early in development by gene expression and epidermal changes, with the Dickkopf 4 gene playing a crucial role.

A protein called sFRP4 from skin cells stops the development of pigment-producing cells in hair.

Different fish use the same genes to regrow teeth.