Four-way Venn diagram for gene families of four <i>Campylobacters</i>.

<p><i>C. jejuni</i>, <i>C. coli</i>, <i>C. lari</i>, and <i>C.upsaliensis</i> from <i>jejuni</i> lineage (based on core gene tree) are shown. The absolute numbers of the core and the dispensable and unique gene families of the four species are all shown.