11.   They will talk about the link between violent, anti-social behavior and low levels of the brain chemical serotonin.

12.   Underlying these emotional issues, doctors say, may be an imbalance of a brain chemical called serotonin, known to be linked to depression.

13.   What doctors do know is that raising levels of the brain chemical serotonin can alleviate tension and irritability.

14.   While the cause of PMS is unknown, it is thought to be related to low levels of the brain chemical serotonin.

15.   While the SSRIs act to modulate the brain chemical serotonin, which controls moods, the newer medications act on both serotonin and noradrenaline, another brain chemical.

16.   Antidepressants affecting the brain chemical serotonin offer some help to certain binge eaters, but not all, and they can cause side effects.

17.   He and his colleagues reported in Archives of General Psychiatry on the effects of the drug clomipramine on the brain chemical serotonin.

18.   So, too, are anti-anxiety drugs and anti-depression medicines that affect levels of the brain chemical serotonin.

19.   The Food and Drug Administration this week approved Luvox, a drug believed to improve an imbalance of the brain chemical serotonin, to fight the disease.