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First-time mothers had higher stress hormone levels in late pregnancy than mothers who had given birth before.

Humans have ancient DNA from Neanderthals and other lineages in their chromosomes, affecting traits and evolution.

Hair cortisol can measure chronic stress but has inconsistent results.

A gene called BMAL1 plays a role in controlling hair growth.

Aging changes skin cells, leading to different DNA methylation and gene activity, affecting cell metabolism and aging signs.

Working night shifts for four days can lower the body's ability to use insulin, which may increase the risk of type 2 diabetes.

Hair cortisol is a reliable long-term stress marker during pregnancy.

Traditional methods may not fully capture how the brain and breathing systems respond to carbon dioxide changes.

Lower melatonin levels are linked to more skin aging.

Certain maturity signs appear before and after the first release of sperm in boys.

Exercising women with irregular periods have lower thyroid hormone levels and less body fat.

Sleep, testosterone levels, and a specific enzyme activity affect skin oil production in women.

Constant-release melatonin reduces SOX21 gene expression in goats during the hair follicle resting phase.

Males and females differ in lifespan, growth, organ size, metabolism, and brain structure, with females generally living longer and maturing earlier.

Hair cortisol levels decrease as children age, stabilizing around age 4.

Chronological age affects the mouse auditory cortex more than hearing loss, and the brain may be less sensitive to mitochondrial dysfunction.

Men with enlarged prostates often have more severe baldness.

Hair growth cycles need varied signals in space and time.

Melatonin can increase cashmere yield by altering gene expression and restarting the growth cycle early.

Cells communicate with neighbors to coordinate their development.

Human hair follicle organ culture is a useful model for hair research with potential for studying hair biology and testing treatments.

Chronic exposure to sunlight may worsen male pattern baldness and protecting the scalp from the sun could slow it down.

Hormonal changes after childbirth and menopause can lead to women's hair loss and facial hair growth, with a need for better treatments.

Some nutrients and antioxidants may improve skin and hair health, but more research is needed to confirm these benefits.

Proteins like aPKC and PDGF-AA, substances like adenosine and ATP, and adipose-derived stem cells all play important roles in hair growth and health, and could potentially be used to treat hair loss and skin conditions.

Hair chromium levels show past nutritional status, not environmental exposure.

Menstrual cycles can be irregular for women of childbearing age.

Researchers improved a method to more accurately estimate when and how long a drug was taken using hair analysis.