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Neighbor-joining trees showing relationships among 72 mapA (A) and 126 ceuE (B) unique gene sequences from Campylobacter genomes from cases of human disease in Oxfordshire (2011 to 2013). Adjacent Venn diagrams indicate the numbers of species-specific and shared alleles. X →, C. jejuni-specific allele detected in C. coli, where X is the allele number; ●, putative introgressed alleles; ▲, putative clade 3 C. coli alleles. C. jejuni, blue; C. coli, yellow; shared alleles, gray.
