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Graph showing the allelic variants for each single plasmid gene (pgp1–8) with respect to the observed plasmid clusters (cluster 1 to 6) among 157 Chlamydia trachomatis isolates. Each allelic variant received a unique colour as shown in the colour legend. Allelic numbers were randomly assigned to each unique allelic variant of a single plasmid gene (pgp1–8). Specific allelic numbers can be assigned to multiple plasmid genes
