Cover: Outermost rings: chromosome coordinates of genes, barred bands are genes in two DNA strands coded for type of gene product; the locations of rRNA operons as arrows inside the outermost rings were all provided by Guy Plunket III, University of Wisconsin and reflect information from the paper on Escherichia coli in this issue [Riley et al. (2006) Nucleic Acids Res., 34, 1–9]. The inner ring shows proportions of types of gene products in E.coli from this paper and was provided by Margrethe Serres, Marine Biological Laboratory; the central image of a streak of colonies of E.coli was provided by Gavin Thomas, University of York, UK.
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