[1] HARVARD UNIV,NEW ENGLAND REG PRIMATE RES CTR,SCH MED,SOUTHBOROUGH,MA 01772
[2] UNIV ERLANGEN NURNBERG,INST KLIN VIROL,D-8520 ERLANGEN,FED REP GER
[3] UNIV MASSACHUSETTS,SCH MED,DEPT PHARMACOL,WORCESTER,MA 01605
[4] UNIV MASSACHUSETTS,SCH MED,DEPT MOLEC GENET & MICROBIOL,WORCESTER,MA 01605