[1] DUKE UNIV,MED CTR,HOWARD HUGHES MED INST,DEPT MED,BOX 3821,DURHAM,NC 27710
[2] DUKE UNIV,MED CTR,DEPT BIOCHEM,DURHAM,NC 27710
[3] DUKE UNIV,MED CTR,DEPT PHYSIOL,DURHAM,NC 27710
[4] MERCK SHARP & DOHME RES LABS,DEPT VIRUS & CELL BIOL RES,W POINT,PA 19486
[5] YALE UNIV,SCH MED,DEPT HUMAN GENET,NEW HAVEN,CT 06510