| Model |
---|
PI | ABRWY | ABRW+Y | ABRWY+Y | ABRWY+Y' |
---|
A~W* | Â | Â | Â | Â |
A~B* | Â | Â | Â | Â |
 | A~Y* | A~Y** | A~Y** | A~Y* |
 |  | A~Y* | A~Y* |  |
A~R* | Â | Â | Â | Â |
 | A~Y** |  |  |  |
A~R** | Â | Â | Â | Â |
A~B** | Â | Â | Â | Â |
 |  |  |  | A~Y** |
A~W** | Â | Â | Â | Â |
- * Within-operon PIs; ** Across-operon PIs
- These rankings are based on the difference between the relative occurrence of PIs from predicted pathways and the relative occurrence of PIs from shuffled pathways (Additional file 8). Relative occurrences are calculated as (number of observed occurrences of PIs of type A~X)/(total number of observed occurrences of PIs).