Highly variable regions of P. gingivalis. Breakpoint analysis of test strains describing potential lacking genomic regions as positioned on the W83 genome sequence. Black lines depict breakpoint data. As long as the line is flat there is low variability of the test strain compared to W83. Dips in the line indicate variability. Blue lines/rectangles below depict potential absent regions. At the top the probe positions are given as described in the W83 genome . The numbers at the bottom label the 10 highly variable regions in each strain which are explained in the text. CRISPR represents a region of interest with CRISPR associated genes as described in the text.