Doctor Kakarala says the cancer-fighting treatments known as chemotherapy do not control tumors containing cancer stem cells.

VOA: special.2010.06.01

Stem cells have the ability to grow other cells, such as heart, nerve or brain cells.

VOA: special.2010.06.15

As they do this, they destroy the cells.

VOA: special.2010.04.20

When the mechanical properties of this new cartilage were tested, they showed that the regenerated cells were just as effective as the rabbit's naturally formed cartilage.

VOA: standard.2010.08.11

"The detainees were kept naked for weeks, months at a time - kept in very small cells, whose temperatures were kept artificially low, sometimes to the extent that the naked detainees, as one official said,seemed to turn blue,"

VOA: standard.2009.03.23