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High-resolution x-ray images showed three main structures in human hair: medulla, cortex, and cuticle.

Neonate scalp hair is thinner, lacks a medulla, and has smaller follicles compared to adult hair.

Abnormal cuticle and hair shaft medulla cause hair loss in androgenetic alopecia; sonography helps diagnose and manage it.

Msx2 and Foxn1 are both crucial for hair growth and health.

The gene Foxq1, controlled by Hoxc13, is crucial for hair follicle differentiation.

Infrared and Raman imaging can non-destructively analyze hair structure and help diagnose hair conditions.

The research found two types of calcium in human hair, one that varies among individuals and another that is consistent across people.

Guinea-pig hair and follicle proteins are mostly similar, but follicles have more group 2 proteins and fewer group 3 and 4 proteins.

Chemical treatments and daily stresses damage hair, especially the cuticle layer.

Human hair has more unsaturated fats inside than on the surface, and certain lipids may help bind the outer and inner layers together.

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

Hair lipids do not protect against humidity.

Some mutant mice have hair with abnormal cross-linking, mainly in the cuticle, not affecting other hair parts.

White hair has less lipid content and absorbs water differently than brown hair.

Stretching damages Caucasian hair's structure more easily than Asian hair.

Wool and hair fibers absorb moisture similarly due to their keratin structure, with the amount of non-crystalline areas affecting the moisture uptake.

Lipids are crucial for healthy hair, protecting it from damage and breakage.

Oxidative hair dye changes hair color and structure but doesn't weaken it.

A more sensitive assay was developed to detect enzyme activity converting arginine to citrulline in hair follicles.

As sheep age, their hair fibers and follicles grow larger and more organized, with no significant differences between males and females.

X-ray microscopy can non-invasively show hair structure changes after treatments, but it's less detailed than TEM and needs improvement.

Older thin hair is not just thinner but also has different shape, structure, and stiffness.

Heating human hair creates hollow microtubes with smooth surfaces.

The study found unique microscopic features for hair or feather in five animal ingredients in Shenrongbian pill.

Hair analysis can detect drug use but is costly and interpretation is complex.

Hair growth is driven by cells that move and change like a conveyor belt.

Horse skin has a layered epidermis, a dermis with hair follicles, sweat and sebaceous glands, and is supplied by small arteries.

Hair fibers degrade and change color in very basic water.

Otter rabbit, mink, and blue fox fur can be identified by their unique hair structures.

Two mouse mutants have defective hair cuticle cross-linking.