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The study found that tight junctions reach the top layer of the skin's stratum granulosum, not just the second top layer as previously thought.

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

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

Hair and nails are skin parts that develop early and serve protective and functional roles.

The 4C32 gene may help in mouse skin development and differentiation.

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

Keratinocytes grew and migrated into hair follicle areas but disappeared after 15-20 days.

The biology of skin and hair is complex and not fully understood.

Holes in mature hair are likely caused by the removal of substances during hair care.

Human hair follicle cells can be used to help heal and replace skin.

The hair follicle's connection to connective tissue is weaker than the skin's.

Keratins in Malayan pangolins vary by region, suggesting scales evolved from the tail towards the head.

Epidermal cysts come from the skin, while pilar cysts come from hair follicles.

Basal layer skin cells help form the epidermis and hair follicles.

Researchers developed a method to grow skin-like tissue from hair cells.

Hairless mice have longer hair follicles and abnormal structures during the catagen phase.

Desmocollin 1 helps maintain skin structure during fetal development.

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

pCLCA2 protein may help maintain skin structure and function.

Involucrin helps strengthen the inner parts of human hair.

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

Hair follicle cells and skin cells differ in keratinization and other features.

Heterotypic cell contacts likely help hair matrix cells differentiate during mouse hair follicle development.

The study created hair-bearing skin models that lack a key protein for skin layer attachment, limiting their use for certain skin disease research.

The southern elephant seal's skin layer helps waterproof the skin by being tightly connected to hair shafts.

Junctional proteins stabilize the inner root sheath and connect the companion layer in human hair.

Human nails contain both skin and hair keratins, each needing different extraction methods.