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The skin systems of jawed vertebrates evolved diverse appendages like hair and scales from a common structure over 420 million years ago.

Small hormonal imbalances can cause significant health problems, so more sensitive testing for hormone-disrupting chemicals is needed.

Chemicals and body size might change when puberty starts and progresses, but more research is needed to confirm this.

Small changes in hormones can significantly impact health, showing the importance of sensitive testing for chemicals that disrupt hormones.

Products should be called 'sperm-safe' only after thorough, well-designed tests.

The document suggests using natural remedies like bloodletting and honey for various health issues but lacks scientific evidence for their effectiveness.

Menstrual disorders are common in adolescents and can be influenced by weight, activity, and health issues, requiring careful evaluation and more research for effective treatment.

Testosterone and its byproducts help support male sexual behavior through different pathways in the brain and body.

Using hair loss drugs finasteride and dutasteride may cause sexual side effects.

Finasteride can cause sexual problems and depression in young men.

Many women experience sexual dysfunction, but few seek help, and better treatment and medical training are needed.

Effective, well-tolerated, and affordable treatments are needed for recurrent ischemic priapism.

Oral propranolol successfully treated a baby's skin growth and ulceration linked to PELVIS syndrome.

Modified stem cells from umbilical cord blood can make hair grow faster.

5α-reductase inhibitors can cause serious and possibly lasting sexual and psychological side effects.

Hormonal changes and psychological issues can cause sexual dysfunction in postmenopausal women. Behavioral therapy is recommended first, with hormone replacement helping some symptoms but not libido. Testosterone can improve libido, but its effects on overall sexual function are unclear. Emotional and relationship issues should be addressed before using medication, and the benefits and risks of testosterone supplementation should be considered.

Testosterone is important for men's sexual function, may help some women's sexual desire, while other hormones and neurotransmitters also play complex roles in sexual behavior.

PFS and PSSD are similar conditions with persistent sexual dysfunction after stopping medication.

A genetic region near the PAX1 gene is linked to a higher risk of scoliosis in females.

The engineered yeast strain BLYAS can quickly and sensitively detect androgenic chemicals.

Substances from fat-derived stem cells can promote hair growth and counteract hormone-related hair loss by activating a key hair growth pathway.

Most children with skin inflammation taking methotrexate had lab abnormalities, but liver issues often improved without changing the medication dose.

Low oxygen conditions improve how well certain stem cells from embryos can make hair grow longer and faster.

Testosterone implants in women require pharmacological dosing to be effective and are generally safe and well-tolerated.

Sex steroids produced in the hippocampus are crucial for brain functions like memory and learning in rodents.

Using rodents for research shows that health problems in the womb can cause diseases later in life.

Neurosteroids show promise for treating epilepsy and more research is needed.

Finasteride reduces Tourette syndrome symptoms, but results may be limited due to potential biases.

Some hormone-related drugs may protect brain cells in Parkinson's disease differently in men and women.

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