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

Melatonin causes weasels to grow white fur and become reproductively inactive.

Finasteride exposure harms tadpole reproduction and hormone balance.

A 10-year-old boy with abnormal genital development had surgery and tests to find the cause and plan treatment.

Using anabolic-androgenic steroids can harm men's reproductive health and increase the risk of heart problems and death.

Mouflon rams mature gradually with changes in body, horns, and hormones linked to age and seasons, reaching full sexual maturity well after puberty.

Melatonin implants affect the growth and pattern of cashmere goat fleece depending on the time of year they are given.

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

Scientists restored fertility in male mice lacking a key fertility gene by using a modified gene.

Sex hormones affect hair and feather growth and may help manage alopecia and hormone-dependent cancers.

Hair growth is influenced by interactions between skin layers, growth factors, and hormones, but the exact mechanisms are not fully understood.

RORA plays a key role in controlling seasonal hair molting by affecting hair follicle cell activity.

Melatonin treatment speeds up fur maturation and changes the hair growth cycle in young chinchillas.

Adrenal glands delay the start of winter fur growth in mink.

Melanocyte precursors in human fetal skin follow a specific migration pattern and some remain in the skin's deeper layers.

The article concludes that better understanding gene regulation related to seasonal changes can offer insights into the mechanisms of seasonal timing in mammals.

Melatonin treatment increases a specific RNA in goat cells that boosts cashmere growth.

Environmental factors like temperature and nutrition affect hair growth, with humans showing seasonal hair growth differences.

Melatonin helps regulate hair growth and protects the hair follicle from stress.

The document concludes that for hair and feather growth, it's better to target the environment around stem cells than the cells themselves.

A man with testotoxicosis was fertile despite low FSH levels, suggesting high testosterone may allow sperm production without FSH.

Understanding the genetics of rare inherited ichthyosis syndromes is key for better treatments and genetic counseling.

Animals that change color with the seasons mainly do so in response to daylight changes, but climate change is causing camouflage problems that may require evolutionary changes.

Long-term testosterone therapy can cause hormone suppression, affect prostate and heart health, and alter physical characteristics, but does not increase prostate cancer risk and needs more research for full risk assessment.

Some common medications can harm male fertility, but many effects can be reversed.

The combination of cyproterone acetate and testosterone enanthate is highly effective in preventing sperm production and could be a good reversible male contraceptive.

Removing a testicular tumor in a dog reduced its aggressive behavior and skin problems.

Omega-6 fats in certain cells boost male hormone production.

A man developed hair loss from testosterone treatment but improved with additional medication.

Stem cells regenerate tissues and their behavior varies by environment, suggesting the hematopoietic system model may need revision.