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Business Segments
 12 Months Ended
Dec. 31, 2011
Business Segments  
Business Segments

L.    Business Segments

        We have determined that we conduct our operations in one business segment: the manufacture, development and commercialization of products derived from our proprietary technology for use in treating human diseases. Long-lived assets consist entirely of property and equipment and are located in the U.S. for all periods presented.