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Front cover illustration

Photograph of wild-type strains of Serratia marcescens ATCC 274, Serratia sp. ATCC 39006 and different Serratia sp. ATCC 39006 pig biosynthetic mutants grown on peptone glycerol medium. The strains shown are (from the top, working clockwise), Serratia 39006 pig biosynthetic mutant, Serratia 39006 wild-type, three Serratia 39006 pig biosynthetic mutants and S. marcescens ATCC 274 wild-type. The pigmented edges of the three pig biosynthetic mutants in the lower half of the agar plate result from where cross-feeding of biosynthetic intermediates has occurred. Photograph courtesy Dr Neil R. Williamson, Department of Biochemistry, University of Cambridge. See the paper in this issue by Harris et al., pp. 3547-3560.