Chemical 'could aid IVF embryos'
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Adding a key chemical to the fluid in which IVF embryos grow could help prevent developmental problems in babies, scientists suggest.
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Scientists in California say they have produced embryos that are clones of two men, a potential step toward developing scientifically valuable stem cells.
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Carrying out checks on embryos for genetic disorders incurs no more risk than standard IVF, work suggests.
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DALLAS _ Scientists say the Bush administration is developing a chemical testing program that favors the chemical industry when it comes to judging whether certain substances in the environment might cause cancer, infertility, or harm to babies in the womb.
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Making human-animal embryos for  scientific experiments should be allowed because of the  benefits to science and medicine, British experts said in a  report released for Sunday.
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Medical research using hybrid human-animal embryos is "vital" in the fight against disease, scientists say.
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Scientists proposed a new theory this week for how identical twins are formed as embryos, in a discovery that may improve a broad range of artificial reproduction techniques.
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Science & environment: Â· Women better off being fast-tracked to IVFÂ· Drug adds to cost and increases risks
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Science & environment: Scientists create human embryos in procedure to try to fight serious inherited diseases
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British scientists say they have created human embryos containing DNA from two women and a man
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Screening embryos for chromosomal defects, a fast-growing practice aimed at helping older women to have a baby, in fact reduces the chance of a successful pregnancy, doctors reported here on Wednesday.
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The government is looking into calls to lift a ban on creating embryos from dying children to aid key research.
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Regulators are due to make a decision on whether to allow human-animal embryos to be used for research in the UK.
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Science & environment: Â· IVM uses fewer drugs and is cheaper than IVF Â· Five pregnancies achieved with 'safer' technique
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IVF babies may be up to nine times more likely to develop a rare disorder that can cause cancer, a study suggests.
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Expensive genetic screening reduces the chance of successful IVF, rather than boosts it, a study finds.
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The chemical compound in the  abortion pill RU-486 blocked formation in mice of breast tumors  caused by a mutant gene blamed in many women's breast and  ovarian cancers, researchers found.