Figure 1.

High-density map of the S. meliloti 1021 chromosome, represented for convenience in six linear contiguous parts of ≈600 kb. Left presents the gene marker positions, whereas the Right shows the location of STS markers. Markers with aligned sequences are positioned on the same line. Spacing between each marker is estimated to ≈9 kb. On the Right side, the 48 BAC clones forming the minimal set of overlapping clones needed to cover the whole chromosome are shown. For convenience, genes belonging to the same operon are designated by their generic name followed by operon (for example cyc operon represents cycHJKL).