[1] NCI,TUMOR CELL BIOL LAB,BETHESDA,MD 20014
[2] UNIV TEXAS,MD ANDERSON HOSP & TUMOR INST,DEPT DEV THERAPEUT,HOUSTON,TX 77030
[3] UNIV TEXAS,MD ANDERSON HOSP & TUMOR INST,DEPT LAB MED,HOUSTON,TX 77030
[4] BIOTECH RES LABS,ROCKVILLE,MD
[5] BUR BIOL,DIV VIROL,BETHESDA,MD
[6] DUKE UNIV,DEPT MICROBIOL & IMMUNOL,DURHAM,NC 27706