[1] UNIV PENN,SCH MED,DEPT HEMATOL ONCOL,PHILADELPHIA,PA 19104
[2] CORNELL UNIV,MED CTR,COLL MED,DEPT CELL BIOL & ANAT,NEW YORK,NY 10021
[3] PRINCETON UNIV,DEPT MOLEC BIOL,PRINCETON,NJ 08544
[4] UNIV PENN,SCH MED,DEPT MED,PHILADELPHIA,PA 19104
[5] UNIV PENN,SCH MED,DEPT PATHOL,PHILADELPHIA,PA 19104
[6] UNIV PENN,SCH MED,DEPT LAB MED,PHILADELPHIA,PA 19104