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COVID-19 may affect male fertility and women might have better outcomes due to hormonal and immune differences.

Constant light exposure during pregnancy changes newborn rabbits' skin, affecting hair follicles, skin thickness, and pigment cells.

Hairless protein is key for hair growth, cell differences cause gene expression variation, and the N-end rule pathway senses nitric oxide for protein breakdown.

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.

Mice are useful for researching human hair loss and testing treatments, despite some differences between species.

Hair analysis can show nutritional status and environmental exposure, with phosphorus being very stable in hair and differences found based on gender and conditions like depression and autism.

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

Aging scalp skin contributes to hair aging and loss, and more research is needed to develop better hair loss treatments.

Genetic differences between young and old Tan sheep explain why their fleece changes from curly to straight as they age.

K16 can partially replace K14 but causes hair loss and skin issues.

Human enzymes can detoxify harmful substances but might also increase their cancer risk.

Cysteine-rich keratins evolved independently in mammals, reptiles, and birds for hard skin structures like hair, claws, and feathers.

Fetal wounds heal without scarring because of different biological factors, which could help improve adult wound healing.

Hair's structure and properties change with pH; acidic pH maintains strength and less swelling, while alkaline pH increases water content and swelling.

Eyelash curvature is linked to the thickness of the cuticle layer at the root.

Keratin 33A is a key protein in goat winter coats, especially in high-producing breeds.

The document concludes that hair analysis is not good for assessing nutrition but can detect long-term heavy metal exposure.

Pigs without the Hairless gene showed skin and thymus changes, useful for studying human hair disorders.

Chromosomal differences affect how muscle cells respond to testosterone.

The PCR technique can identify genetic differences in a wool-related gene among different sheep breeds, which may help improve wool and pelt quality.

The conclusion is that genetic differences affect how the cochlea heals after hair cell loss, which may challenge the creation of hearing loss treatments.

The study found that immune responses disrupt hair growth cycles, causing hair loss in alopecia areata.

Human body's immune cells are more common in the layer of fat just beneath the skin than in deeper fat layers.

The study found that genetic differences related to hair growth and other traits help cashmere goats adapt to high-altitude environments.

Female cuckoo color differences are linked to their unique genes and help avoid male harassment.

Hair loss patterns differ between males and females due to 5 master regulators and JAK-STAT signaling affects hair growth.

Sex hormones affect brain injury differently in males and females.

Hair loss in children is diagnosed and treated differently than in adults, with different common causes and a focus on less invasive methods.

Mutations in the enzyme don't significantly change how it binds to its specific substances.

Keratin 18 helps diagnose and predict cancer progression and affects cancer growth and spread.