[1] YALE UNIV, SCH MED, DEPT HUMAN GENET, NEW HAVEN, CT 06510 USA
[2] YALE UNIV, SCH MED, DEPT LAB MED, NEW HAVEN, CT 06510 USA
[3] YALE UNIV, SCH MED, DEPT MOL BIOPHYS & BIOCHEM, NEW HAVEN, CT 06510 USA
[4] VET ADM MED CTR, VIROL LAB, West Haven, CT 06516 USA
[5] FRED HUTCHINSON CANC RES CTR, DIV TUMOR BIOL, SEATTLE, WA 98104 USA