[1] UNIV CALIF IRVINE,DEPT MOLEC GENET & MICROBIOL,IRVINE,CA 92717
[2] UNIV CALIF IRVINE,DEPT BIOCHEM & MOLEC BIOL,IRVINE,CA 92717
[3] UNIV CALIF IRVINE,DEPT MED,IRVINE,CA 92717
[4] UNIV UTAH,SCH MED,DEPT CELLULAR VIRAL & MOLEC BIOL,SALT LAKE CITY,UT 84132