Synteny in the ELK region pkn3-relA. Genes shown in the same color in the different strains encode proteins with high homology. The numbers over the first gene in each strain indicate the location of the genes in the genome. Mx, M. xanthus; Sa, S. aurantiaca; Ad, A. dehalogenans; AK, Anaeromyxobacter sp. K; AF, Anaeromyxobacter sp. Fw109–5; + and − indicate that the genes are encoded in the plus or the minus strand, respectively.