[1] UNIV HOUSTON, DEPT BIOPHYS SCI, HOUSTON, TX 77004 USA
[2] TECH UNIV MUNICH, DEPT MICROBIOL, D-8000 MUNICH 2, GERMANY
[3] UNIV ILLINOIS, DEPT DAIRY SCI, URBANA, IL 61801 USA
[4] CORNELL UNIV, BIOCHEM MOLEC & CELL BIOL SECT, ITHACA, NY 14853 USA
[5] UNIV ROCHESTER, MED CTR, DEPT MICROBIOL, ROCHESTER, NY 14642 USA
[6] PLANT BREEDING INST, CAMBRIDGE CB2 2LQ, ENGLAND
[7] UNIV ILLINOIS, DEPT MICROBIOL, URBANA, IL 61801 USA
[8] STANFORD UNIV, MED CTR, DEPT BIOCHEM, STANFORD, CA 94305 USA
[9] UNIV NEW HAMPSHIRE, DEPT MICROBIOL, DURHAM, NH 03824 USA
[10] DALHOUSIE UNIV, DEPT BIOCHEM, HALIFAX, NS, CANADA
[11] NATL JEWISH HOSP & RES CTR, DENVER, CO 80206 USA
[12] UNIV ILLINOIS, DEPT GENET & DEV, URBANA, IL 61801 USA