Those with the short form of the transporter gene and a history of stressful experiences reported more than average symptoms of depression.

Those with the short form of the serotonin transporter gene and a history of stressful experiences reported more than average symptoms of depression.

Explanation:

The serotonin transporter gene has received the most attention in relation to depression, either alone or in conjunction with exposure to stressful life events.

answer; 4% i believe this is correct;