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Cat claws stay sharp by shedding their outer layer through microcracks formed during activities.

The enzyme DHHC13 is essential for healthy hair and skin, and its deficiency leads to hair loss and skin problems.

Human nails and hair follicles have similar gene activity, especially in the cells that contribute to their growth and development.

The CUBIC protocol allows detailed 3D visualization of proteins in mouse skin biopsies.

Confocal Laser Scanning Microscopy (CLSM) is a useful tool for studying how drugs interact with skin and diagnosing skin disorders, despite some limitations.

Scientists have improved 3D models of human skin for research and medical uses, but still face challenges in perfectly replicating real skin.

Bioprinting could greatly improve health outcomes but faces challenges like material choice and ensuring long-term survival of printed tissues.

New materials that better mimic natural skin structure could improve healing, especially for chronic wounds.

The document concludes that understanding the evolution of the human face helps cosmetic surgeons meet aesthetic desires.

The study suggests that the arrector pili muscle is important for hair health and its damage might contribute to hair loss.

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

Hexi cashmere goats' hair growth varies by stage, with Hoxc13 linked to hair activity.

Most dogs have hair whorls on their chest and limbs, with shelter dogs and short-haired dogs having more chest whorls.

A new method using visual aids to diagnose hair diseases was effective after brief training.

Hormones control reproduction and are crucial for body balance.

The nucleus is key in controlling skin growth and repair by coordinating signals, gene regulators, and epigenetic changes.

Lizards can regrow their tail scales with the same structure, distribution, and gender-specific features as the original ones, and this unique ability is not seen in adult mammals.

Shrunken heads retain some facial features and hair characteristics, allowing for limited individual identification.

The document concludes that while some organisms can regenerate body parts, mammals generally cannot, and cancer progression is complex, involving mutations rather than a strict stem cell hierarchy.

Blepharoptosis surgery usually lowers the eyebrows, especially near the nose.

Lasers are FDA-approved for permanent hair reduction, not removal, and more research is needed to improve treatments.

Most patients with Lichen planopilaris improved with acitretin, but treatments often didn't work well; preventing infection in skin surgery is important, and bupivacaine might be a better anesthetic.

Pig skin is a good substitute for human skin to measure drug absorption, but differences in skin structure and enzymes across species must be considered.

The document concludes that hair is complex, with a detailed growth cycle, structure, and clinical importance, affecting various scientific and medical fields.

Scientists found a way to grow human hair cells in a lab that can create new hair when transplanted.

Keratin 79 marks a new group of cells that are key for creating and repairing the hair follicle's structure.

The research provides specific measurements for hair follicles that can improve hair transplant and regeneration techniques.

Recognizing specific features of African-American hair can help diagnose hair loss conditions.

Lizards can regrow their tails, and studying this process helps understand scar-free healing and limb regeneration.

Good preoperative assessment is crucial for safe and effective eyelid and brow cosmetic surgery.