[1] UNIV MASSACHUSETTS,DEPT BIOCHEM,AMHERST,MA 01003
[2] YALE UNIV,SCH MED,YALE ARBOVIRUS RES UNIT,NEW HAVEN,CT 06510
[3] USA,MED RES INST INFECT DIS,DEPT VIRAL BIOL,FREDERICK,MD 21701
[4] WALTER REED ARMY INST MED RES,DEPT MOLEC BIOL,WASHINGTON,DC 20307
[5] WALTER REED ARMY INST MED RES,DEPT VIRUS DIS,WASHINGTON,DC 20307
[6] UNIV MASSACHUSETTS,PROGRAM MOLEC & CELLULAR BIOL,AMHERST,MA 01003