FIGURE 2.

Diagram of the insertion site for accessory modules (variable regions). The genes are indicated by arrows; the shaded parts indicate homologous regions (nucleotide homology >95%). Numbers 1 to 5 represent the hotspots with insertions of variable regions, the red arrow and the mark directly above it indicate the specific position and element of the insertion, and the oblique upward arrow marked on the right side of the part of the red arrow indicates the base of the backbone in the prophage caused by the insertion of the variable region, resulting in deletions of the base (accurate to 0.1 kb).