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Zolpidem shows up in hair from the top back of the head after one dose and fades over time, suggesting it gets into hair through blood and sweat.

Hair and nail cells share similar proteins, indicating a common differentiation pathway.

Children's hairlines change shape as they grow, with women often developing a widow's peak and men's hairlines becoming more convex and possibly balding at the temples, influenced by genetics and hormones.

A hair transplant using hair from the back of the head and pubic area was successful in creating a feminine hairline for a male-to-female transgender person.

Men with baldness at the front and top of their head at age 45 may have a higher risk of aggressive prostate cancer.

The document concludes that pregnancy and cancer share immune evasion tactics, but more research is needed before using checkpoint blockade immunotherapy in pregnant cancer patients to avoid harm to the placenta.

Cells from certain embryo parts can induce head formation in another embryo, involving complex signaling pathways.

PRP injections did not significantly improve hair growth in men with androgenetic alopecia.

Various substances, quitting smoking, and certain topical applications can enhance the survival of skin flaps used in surgery. Oxygen-free radicals play a role in tissue injury, but certain treatments can have beneficial effects.

Human skin's melanocytes respond to light by changing shape, producing pigments and hormones, which may affect sleep patterns.

New methods to classify curly hair types were developed based on shape and strength.

Dutasteride and finasteride may reduce sperm count and volume but don't affect movement or shape; effects are reversible after stopping.

Future hair cosmetics will be safer and more effective.

Both tissue expansion and serial excision are effective for scar revision in the head and neck area.

Hair thickness decreases from the upper to lower areas of the back of the head, affecting hair transplant results.

Using cheek skin and cartilage grafts for nose reconstruction after skin cancer surgery can maintain shape and function but may require multiple surgeries and hair removal in men.

Creators of YouTube 'bro-science' baldness videos are driven by a need to share and persuade, often emphasizing authenticity and community building, while navigating trust issues related to commercial ties.

Black hair's diversity in patterns and textures is influenced by follicle shape and keratin, and it holds cultural, artistic, and mathematical significance.

Modulating BMP activity changes the number, size, shape, and type of ectodermal organs.

The study developed a tool to predict how gut microbes process foods and drugs, showing that similar compounds often share metabolic pathways and effects.

The model suggests that scalp tension could lead to hair loss, with factors like blood vessel hardening, enlarged oil glands, and poor microcirculation also playing a role. It also hints at a possible link between skull shape and baldness pattern.

Scalp flaps are stiffer than skin from other body areas, which helps in planning reconstructive and cosmetic head surgeries.

About 21.3% of young, healthy Chinese men experience hair loss. Hairlines are mostly linear or have a central protrusion. Hair is densest on the top and back of the head, and hair follicles usually have 1 or 2 hairs. This information can help in designing hair restoration procedures.

Surgical methods for hair loss due to scarring should be chosen based on the size, location, and shape of the area, with most patients seeing good results.

Dermal papillae cells, important for hair growth, come from multiple cell lines and can be formed by skin cells, regardless of their origin or hair cycle phase. These cells rarely divide, but their ability to shape tissue may contribute to their efficiency in inducing hair growth.

Hair restoration techniques and new cell sources improve hair loss treatments.

A man with severe hair loss regrew hair after hormone treatment.

The document concludes that hair transplantation for Asians should consider unique scalp and hair traits, use small grafts, and combine surgery with medication like finasteride and minoxidil for best results.

The BASP classification is a detailed and accurate way to categorize hair loss in both men and women.

Humans and pets share similar allergy mechanisms, and studying pet allergies can help treat both human and animal allergies.