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Chemotherapy in the first trimester of pregnancy is risky, but in the second and third trimesters, it's generally safe with careful drug selection and timing.

Isotretinoin can cause serious birth defects and needs careful use, especially in pregnant women.

Atrazine causes birth defects in rats, and finasteride can reliably create a hypospadias model.

A new 3-D bioreactor system improves drug screening and reduces animal testing.

Use some skin medications with caution during pregnancy; avoid strong steroids, certain eczema treatments, and systemic retinoids, but many topical treatments and nasal sprays are safe.

Ethylenthiourea is toxic to the liver and nervous system, especially with alcohol.

Mutations in β1 integrins cause embryonic death but have milder effects on skin.

Melanoma cells lose their ability to form tumors when placed in a zebrafish embryo environment.

TCDD reduces EGF receptors in the liver, affecting growth and development.

Metformin helps with menstrual cycles and insulin levels in PCOS but is less effective for hair growth, diabetes prevention, and weight loss, and may improve fertility and reduce diabetes risk.

The document concludes that the exact way alcohol causes harm to fetal development is unknown, but it significantly affects nutrient transport to the fetus and a safe level of alcohol during pregnancy is not determined.

The document says to treat cat fungal infections with medicine and clean the environment, noting that cats without symptoms can still spread it to humans.

Albendazole treatment for echinococcosis can cause serious side effects and requires close monitoring.

Daily intake of 0.5 or 5 mg cobalt ferrite nanoparticles can harm lungs through oxidative and inflammatory stress.

The new FDA labeling rules provide more detailed drug safety information for pregnant and breastfeeding women, but more data is needed on the risks of many dermatologic drugs.

The conclusion is that more research is needed to better understand and treat adult acne, and that patient education and simple treatment plans are important for better results.

Exposure to certain glycol ethers during pregnancy may be linked to lower verbal comprehension in children.

Ets2 gene is crucial for placental development in mice.

Mouse embryos can develop in chick embryos, but they grow smaller with some organ issues.

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

Selenium can be toxic to animals, causing serious health issues, especially in horses.

Innovative methods are reducing animal testing and improving biomedical research.

Maternal aspartame consumption during pregnancy leads to skin damage and higher apoptosis in newborn rat offspring.

Understanding embryologic layers improves skin disorder diagnosis and supports developing targeted therapies.

Diphenyl cresyl phosphate has low toxicity but can harm the liver, kidneys, adrenal glands, and testicles at high doses.

2-Ethylhexanoic acid harms fertility and delays development in rats.

Hormonal treatments affect cow fertility and early embryo development.