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The conclusion is that substances can penetrate hair fibers through multiple pathways, including both the cell membrane complex and the non-keratinous parts.

Disulfide bonds make keratin in hair stronger and tougher.

Hair follicles form hard α-keratin filaments in four steps, showing structural differences.

Hair structure forms the same way inside and outside the body.

The epidermis is crucial for hair growth.

Reptile skin hardens by layering beta-proteins on keratin.

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

Two mouse mutants have defective hair cuticle cross-linking.

The lipid in human hair follicles acts as a barrier, similar to the skin's lipid layer.

The molecular details of hair growth are not well understood.

Human hair has a new region with ordered filaments and the cuticle contains β-keratin sheets.

More research is needed to understand how hair keratins work and their role in hair disorders.

Hair's strength and flexibility come from its protein structure and molecular interactions.

A new pair of mouse keratins, 65 kD and 48 kD, are found in specific skin areas and are linked to a unique skin differentiation type.

Hair keratins are mainly on macrofibrils in the cortex and in the endocuticle in the cuticle.

The conclusion is that new methods for isolating hair cuticle cells and removing the cuticle layer are effective and convenient.

The cornified cell envelope forms a protective barrier in skin and hair, using specific proteins and lipids to maintain effectiveness.

A specific type of skin cell creates an opening for hair to grow out, and problems with this process can lead to skin conditions.

Understanding proteins in skin structures like claws and hair is crucial for future research.

Cuticle damage doesn't affect hair's tensile strength; the cortex is responsible for it.

Lizard claws have hair-like keratins similar to those in mammals.

Hair cuticles remain stable and resilient under stress due to strong protein content and crosslinking.

Keratinization in embryos helped vertebrates adapt to land by forming a protective skin barrier.

Keratins are crucial for hair strength, and mutations in certain keratin genes cause hair disorders.

Different conditions affect how hair proteins assemble, and certain mutations can change their structure.

Hair care products mainly work on the hair's surface and need professional guidance for use.