[1] UNIV NOTTINGHAM,SCH AGR,DEPT APPL BIOCHEM & FOOD SCI,SUTTON BONINGTON,LOUGHBOROUGH LE12 5RD,LEICS,ENGLAND
[2] UNIV DUNDEE,DEPT BIOCHEM,MOLEC GENET LAB,DUNDEE DD1 4HN,SCOTLAND
[3] UNIV ABERDEEN MARISCHAL COLL,DEPT MICROBIOL & GENET,ABERDEEN AB9 1AS,SCOTLAND