The study, which has been authorized by the Food and Drug Administration, will enroll only blacks.

However, studies of several agents are currently enrolling patients.

The recent study enrolled about 1,800 patients who had suffered a heart attack in the past month and now met criteria for depression.

But as of Dec. 18, the study had enrolled only 755 of the 1,562 patients needed at 19 medical centers around the nation.

The double-blind controlled study began in 2002 and enrolled 5,472 participants in 33 countries.

Despite this conclusion, the study continued, and in 1971 enrolled a second generation of participants.

The study has enrolled 22 subjects between the ages of 12 and 45, but the researchers hope eventually to include 80 participants.

The study enrolled 12 men and 25 women.

The study enrolled women up to age 79.

Most studies enrolled only small numbers of patients, and historical control subjects, rather than actual control groups, which were often used for outcome comparisons.