Identity-by-descent. The dynamic IBD track shows intervals of sequence identity computed over the selected subset of strains. Red horizontal bars represent regions of the genome over which all selected strains are substantially identical. IBD is computed from the haplotype group assignments for each interval where strains in the same haplotype group are considered IBD. Regions of IBD are displayed where all selected strains are in the same haplotype group over consecutive compatible intervals. This visualization is computed on the fly according to the user-selected subset of strains.