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Hair growth is controlled by specific gene clusters and proteins, and cysteine affects hair gene expression in sheep.

Healthy hair is shiny, smooth, and has clean ends.

Hair analysis for drugs needs a better understanding of how drugs enter hair, considering factors like hair structure and pigmentation.

Insulinomas and adrenocortical tumors are common in older ferrets, diagnosed with blood tests and ultrasounds, and treated with medications or surgery.

Eating glucoraphanin can help prevent psychosis in offspring whose mothers had immune system activation.

Androgens like testosterone are important hormones for both men and women, made differently in each sex and affecting the body by regulating genes and quick interactions with cell components.

Keratin fibrils in hair form and stop growing at specific points in the follicle.

Finasteride treatment changes brain steroid levels and receptors, affecting brain function even after stopping treatment.

TGase 3 helps build hair structure by forming strong bonds between proteins.

The enzymes Aldh1a2 and Aldh1a3 are involved in making retinoic acid in hair follicles and have different roles in hair growth.

Prenatal stress changes how male and female rats enjoy rewards differently, linked to sex hormones.

The enzyme 5α-reductase is key in causing psychotic-like effects from sleep deprivation.

Pollution exposure speeds up hair damage.

Thioglycolic acid and L-cysteine change hair structure differently during perms, affecting hair strength and curling efficiency.

Women with hair loss had higher levels of certain hormones, suggesting a link to a condition like PCOS.

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

Different tests are used to see how hair care products affect hair, and choosing the right test is important for accurate results.

A dark-haired Chinese girl had hair that looked banded under certain light but was normal under a microscope.

Curly hair breaks due to mechanical damage and environmental factors, not chemical makeup, and needs ongoing care to prevent breakage.

Gut microbes significantly affect brain steroid levels.

Male mice are more susceptible to autism-like changes from valproic acid than female mice.

Managing multiple autoimmune diseases in one patient is extremely challenging.

Hirsutism requires identifying the cause to choose the right treatment, which may include medications like oral contraceptives or dexamethasone.

Cocaine impairs male sexual behavior and alters testosterone metabolism in the brain.

Steroid hormones are crucial for body functions and have various medical uses, but their misuse can lead to dependence.

Low-molecular weight hyaluronate can make damaged hair stronger.

Prdm1 is necessary for early whisker development in mice but not for other hair, and its absence changes nerve and brain patterns related to whiskers.

Acetate helps reduce depression in rats with PCOS by lowering specific gene expression and DNA changes in the brain.

A teenager's hair with alternating white and dark bands, known as Pili annulati, is a genetic condition that is usually harmless and often considered attractive.

Glycylglycine makes hair softer by improving alignment and changing hair's internal properties.