[1] UNIV CALIF LOS ANGELES,SCH MED,INST MOLEC BIOL,LOS ANGELES,CA 90024
[2] UNIV CALIF LOS ANGELES,SCH MED,DEPT MICROBIOL & IMMUNOL,LOS ANGELES,CA 90024
[3] LOUISIANA STATE UNIV,MED CTR,CTR EYE,LIONS EYE RES LABS,NEW ORLEANS,LA 70112
[4] UNIV CALIF IRVINE,DEPT MOLEC BIOL & BIOCHEM,IRVINE,CA 92717