Some scientists now believe that tension headaches may result from changes among brain chemicals such as serotonin.

VOA: special.2010.03.30

They report finding no link between the serotonin transporter gene and the risk of depression.

VOA: special.2009.06.24

"But a baby who has a defect in those brain stem circuits that use serotonin can't do that when challenged and they go on to die."

VOA: standard.2010.02.08

At present,doctors cannot measure the amount of serotonin in a living baby's brain.

VOA: standard.2010.02.08

In studying babies' brains, the researchers found that babies who died of SIDS had 25 percent less serotonin and related chemicals than the babies who died of other causes.

VOA: standard.2010.02.08

The latest research focuses on serotonin, a chemical in the brain.

VOA: standard.2010.02.08

"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