Comparative analysis of the gene order in C. ulcerans , C. diphtheriae and C. pseudotuberculosis. (A), Synteny between the sequenced chromosomes of C. ulcerans 809 and C. ulcerans BR-AD22. (B), Synteny between the chromosome of C. ulcerans 809 and those from C. diphtheriae NCTC 13129 (blue) and C. pseudotuberculosis FRC41 (red). The graphs represent X-Y plots of dots forming syntenic regions between the selected chromosomes. Each dot represents a predicted protein having an orthologous counterpart in another corynebacterial genome, with co-ordinates corresponding to the position of the respective coding region in each genome. Orthologous proteins were detected by reciprocal best BLASTP matches. The genomic positions of putative prophages detected in C. ulcerans are marked in the synteny plots. Symbols: β, β-corynephage of C. diphtheriae NCTC 13129; asterisk, nitrate reductase gene region of C. diphtheriae NCTC 13129.