[1] UNIV MED & DENT NEW JERSEY,ROBERT WOOD JOHNSON MED SCH,DEPT BIOCHEM,HOWARD HUGHES MED INST,PISCATAWAY,NJ 08854
[2] STANFORD UNIV,DNAX RES INST MOLEC & CELLULAR BIOL INC,DEPT CHEM,PALO ALTO,CA 94304
[3] BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973
[4] UNIV CALIF BERKELEY,DEPT BIOCHEM,BERKELEY,CA 94720