[1] CUNY HUNTER COLL,DEPT BIOL SCI,NEW YORK,NY 10021
[2] CUNY HUNTER COLL,CTR STUDY GENE STRUCT & FUNCT,NEW YORK,NY 10021
[3] IMPERIAL CANC RES FUND,CLARE HALL LABS,S MIMMS,HERTS,ENGLAND
[4] INST PASTEUR,UNITE BIOCHEM CELLULAIRE,F-75724 PARIS 15,FRANCE
[5] CHARLES UNIV,DEPT MICROBIOL & GENET,CS-11636 PRAGUE 1,CZECH REPUBLIC