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Robert Lefkowitz was born on April 15, 1943 in New York City. He is an American biochemist and pharmacologist who won the Nobel Prize in Physiology or Medicine in 2012. Lefkowitz is known for his work on G protein-coupled receptors, which are proteins that are activated by molecules called ligands. These receptors play an important role in many biological processes, including the regulation of heart rate, blood pressure, and metabolism.