Celltrion is a contract manufacturing organization with a headquarters in Incheon, South Korea. Celltrion, a biopharmaceutical company, is dedicated to providing high quality services to accelerate product development. Celltrion is also investing in research and development of its own products, as well as licensing from biopharmaceutical research companies throughout the world, in order to develop into a fully integrated biotechnology company. On December 28, 2006, in connection with the exercise of an exclusive option granted to Nexol, VaxGen, Inc. sold 2,183,127 shares of common stock of Celltrion, Inc.