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Zinc oxide nanoparticles in sunscreen do not penetrate deep into the skin.

Chitin and chitosan are useful in cosmetics for oral care, haircare, and skincare, including UV protection and strength improvement.

Pregnancy can cause various skin changes and diseases, with PUPPP being the most common skin condition specific to pregnancy.

Hair follicle development and microbes help regulatory T cells gather in newborn skin.

ATP-dependent chromatin-remodeling complexes are crucial for gene regulation, cell differentiation, and organ development in mammals.

Epigenetic changes control how adult stem cells work and can lead to diseases like cancer if they go wrong.

Zinc is effective for treating various skin conditions, including warts and acne.

The new "differential stripping" method effectively measures how much substance gets into hair follicles.

Stem cells in the hair follicle are regulated by their surrounding environment, which is important for hair growth.

TGF-β signaling is crucial for stem cell maintenance, differentiation, and has implications for cancer treatment.

The conclusion is that Treg-targeted therapies have potential, but more knowledge of Treg biology is needed for effective treatments, including for cancer.

Probiotic bacteria improved skin and hair health in aged mice.

Low doses of some substances can be beneficial, while high doses can be harmful or toxic.

Finasteride effectively treats baldness but may cause sexual side effects.

Fibroblast growth factor receptor signaling controls cell development and repair, and its malfunction can cause disorders and cancer, but it also offers potential for targeted therapies.

Lignans and neolignans from plants may help protect against various health issues, including cancer and heart disease.

COVID-19 can cause skin issues like rashes and "COVID toes," and people with skin conditions should adjust their treatments if they get the virus.

Cystatin M/E strongly inhibits cathepsin V and cathepsin L, important for skin formation.

Hair follicles are hormone-sensitive and involved in growth and other functions, with potential for new treatments, but more research is needed.

Mutations in the PADI3 gene are linked to a higher risk of scarring hair loss in women of African descent.

Spironolactone most effective for hirsutism, but has side effects.

Conditioned media from mesenchymal stem cell cultures could be a more effective alternative for regenerative therapies, but more research is needed.

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

Mammals might fail to regenerate not because they lack the right cells, but because of how cells respond to their surroundings, and changing this environment could enhance regeneration.

Skin development in mammals is controlled by key proteins and signals from underlying cells, involving stem cells for maintenance and repair.

Mesenchymal stem cells show potential for skin healing and anti-aging, but more research is needed for safe use, especially regarding stem cells from induced pluripotent sources.

Women with PCOS often have skin problems like excessive hair, acne, hair loss, and dark patches, which can be treated with hormonal and non-hormonal therapies.

Targeting the skin's endocannabinoid system could help treat skin disorders.

The circadian clock influences the behavior and regeneration of stem cells in the body.

Jasmonic acid and its derivatives play important roles in plant health and have potential uses in medicine and agriculture.