Immerge Biotherapeutics, Inc., 300 Technology Square, Cambridge, MA 02139; Department of Animal Science and Office of Animal Resources, University of Missouri, Columbia, MO 65211; Infigen, Inc., 1825 Infinity Drive, Deforest, WI 52532; and Transplantation Biology Research Center, Massachusetts General Hospital and Harvard Medical School, Boston, MA 02129 (At 2004-05-03)