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  • 24 Feb 2000

    WASHINGTON, D.C.--Beauty ads claim that retinoic acid, better known as vitamin A, removes wrinkles from aging faces. But a new study suggests that it is even more important for very young faces.

  • 14 Feb 2000

    Like plumbers or carpenters at a construction site, each so-called Hox gene was thought to direct just one task in the assembly of a developing embryo.

  • 25 Jan 2000

    A U.S. company has received two British patents that appear to grant it commercial rights to human embryos created by cloning.

  • 19 Jan 2000

    Troubles continue at the Coulston Foundation, the country's largest primate research facility. According to allegations made in the last week by In Defense of Animals (IDA), an animal rights group, six chimpanzees have died at the Alamogordo, New Mexico, lab since last August.

  • 12 Jan 2000

    In life as we know it, proteins are the workhorses of the cell, and the recipes on how to produce them are stored in DNA and RNA.

  • 3 Jan 2000

    Genetically modified silk wasn't in vogue on fashion runways this season, but a designer strain of glow-in-the-dark silkworms suggests that such fabrics may soon be feasible.

  • 20 Dec 1999

    In an experiment that joins the booming fields of stem cells and cloning, scientists have managed to clone mice from embryonic stem cells.

  • 16 Dec 1999

    Science has honored stem cell research as its 1999 "Breakthrough of the Year." This year, scientists published more than a dozen landmark papers on the remarkable abilities of stem cells, which can reproduce while in their immature state and also become more specialized tissues.

  • 8 Dec 1999

    Two unmistakable signs of Alzheimer's disease are the so-called plaques and tangles in a victim's brain. Scientists have a good handle on how plaques form. The tangles have been more of a mystery--until now, that is.

  • 7 Dec 1999

    Once a muscle cell, always a muscle cell--or so scientists used to think. But they were wrong. Stem cells found in muscle can take up residence in bone marrow and give rise to blood cells, according to research described in the current Proceedings of the National Academy of Sciences.