Researchers say the speech impediment appears to stem from a defectin the gene that regulates the way brain cells break down and recycle waste products.

VOA: standard.2010.02.11

Stem cells from very early embryos are able to grow into any tissue in the body.

VOA: special.2009.04.07

But the flow from the stem tip prevents them from doing this.

VOA: special.2009.10.13

Spats within the opposition stem largely from ideological differences among the three opposition parties which consist of a conservative Islamic group that caters to the Malay Muslim majority;

VOA: standard.2009.12.21

The growing strains stem largely from Ankara's increasing criticism of Israel's occupation of Palestinian territory, and more recently, Ankara' canceled joint military exercises with Israel scheduled for later this month.

VOA: standard.2009.10.27

At The Rockefeller University in New York, she is currently studying how skin forms from precursor stem cells, looking for clues that could help researchers understand how defective stem cells can cause cancers and other disorders.

VOA: standard.2010.03.29