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SILVER SPRING, Md. & RESEARCH TRIANGLE PARK, N.C--(BUSINESS WIRE)--United Therapeutics Corporation (Nasdaq: UTHR), a public benefit corporation, today announced that it has entered into an amendment with Arena Pharmaceuticals, Inc. (Arena), a subsidiary of Pfizer Inc., which eliminates all royalty obligations under its exclusive license agreement related to ralinepag in exchange for an up-front payment of $525 million. “This transaction demonstrates our confidence in the revenue opportunity for