51.   The drug, made by Interneuron Pharmaceuticals Inc. and distributed by American Home Products Corp., alters brain chemicals to trick patients into feeling full.

52.   The hunger for social acceptance, Embry said, creates a bath of negative brain chemicals.

53.   The new drugs, selective serotonin reuptake inhibitors, or SSRIs, bolster serotonin, a brain chemical believed to be deficient in some depressed people.

54.   The oils stimulate the production of brain chemicals such as serotonin, which help the body relax.

55.   The markers consist of abnormally high levels of four brain chemicals that help construct the basic architecture of animal brains, researchers said.

56.   The object was to provoke the production of a brain chemical that scientists believe is linked to aggression and violence.

57.   The only difference is that thrill junkies get high on their own brain chemicals.

58.   Then comes attraction, the romantic infatuation that Fisher attributes partly to low levels of serotonin, the brain chemical associated with Prozac and feelings of well-being.

59.   To the rescue are the brain chemicals called endorphins.

60.   Too much or too little of these brain chemicals at different points in development could help explain the spectrum seen in so many children.