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Alliant Energy is the parent of two regulated utilities, Interstate Power and Light and Wisconsin Power and Light, serving nearly 1 million electric customers and 425,000 natural gas-only customers. Both subsidiaries engage in the generation and distribution of electricity and the distribution and transportation of natural gas. Alliant also owns a 16% interest in American Transmission Co.
United Therapeutics specializes in drug development for pulmonary arterial hypertension, a rare and progressive disease marked by abnormally high blood pressure in the arteries of the lungs. The company's therapies for PAH largely focus on the prostacyclin pathway, and many of its treatments are based on the same molecule, treprostinil. Most of the company's sales are generated within the United States. United Therapeutics also markets a pediatric oncology drug, but its focus largely remains in pulmonary arterial hypertension.