"We found that the babies who died of SIDS had abnormalities in serotonin in regions of the brain stem that control breathing and heart rate and blood pressure during sleep."

VOA: standard.2010.02.08

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

VOA: special.2010.06.15

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