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Robert Lefkowitz is a doctor and researcher. He has a medical degree from Columbia University and did his residency at Duke University. He has also been a professor at Duke and Duke University Medical Center. Lefkowitz's research has focused on the structure and function of adrenergic receptors, which are proteins that bind to epinephrine and norepinephrine. He has discovered several important drugs that target these receptors, including beta-blockers and alpha-blockers.