Axelrod was an American biochemist whose investigations into the role of norepinephrine in brain chemistry led to an understanding of how neurotransmitters work and how their levels are regulated. His research made possible the development of antianxiety and antidepressant drugs like Prozac and Zoloft, which are collectively known as selective serotonin reuptake inhibitors. For his efforts, Axelrod shared the 1970 Nobel Prize for Physiology. What was his other major scientific contribution? Discuss