Comparison of SNPs among different natural isolates. (A) The presence of SNPs originally identified in one strain was tested in nine other strains and Bristol N2 by RFLP analysis or sequencing. SNP-containing clones are shown vertically along the chromosomes using their physical map position. Some clones contain multiple SNPs. Eleven unique SNPs in clone W08E3* are not shown in this figure. (B) Local variation was tested by comparison of strains isolated in California for SNPs that can be visualized by RFLP analysis. Most were isolated from flower beds on Caltech campus and from a vegetable garden in Altadena. The presence of a SNP is indicated with a shaded square. Isolates from other locations are plotted for reference.
