Fig. 2

Compressed spacer graphs of Type I-B (A) and Type III-B (B) CRISPR-Cas systems in B. fragilis. Numbered nodes represent a single, unique spacer whereas nodes labeled with numerical intervals represent several consecutive spacers, and directed edges represent the ordering of the spacers in arrays. For the spacers in the same array, spacers closer to the trailer end are numbered with smaller numbers whereas the spacers closer to the leader end get bigger numbers. Nodes containing leader end spacers are highlighted in blue, and nodes containing trailer end spacers are shown in yellow. The compressed spacer graphs provide visual summary of 80 Type I-B CRISPR arrays identified from 80 Zhao2019 isolates (A), and 465 Type III-B CRISPR arrays identified from 410 isolates (B), respectively