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Heat map showing percent similarity of accessory genes across S. Choleraesuis isolates. Accessory genes are divided into genes that frequently found (shell) and genes that rarely found (cloud). There are six groups of accessory genes uniquely found in some isolates. The cut-off for being absent was 65% similarity. The isolates on the right were placed in the same order as the isolates in temporal phylogenetic tree in Figure 1.
