THE WOODLANDS, Texas, March 31 /PRNewswire-FirstCall/ -- Lexicon Pharmaceuticals, Inc. (Nasdaq: LXRX) announced today that it will hold its Annual R&D Day on Thursday, April 8, 2010 from 7:30 a.m. to 11:00 a.m. Eastern Time in New York, New York. Members of Lexicon's senior management...