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Comparison of virulence gene polymorphisms among B. bronchiseptica seal isolates and closely related isolates from terrestrial hosts. The number of nucleotide (a) or predicted amino acid (b) substitutions in the genes evaluated is indicated for comparisons between M85/00/2 and RB50 (black), M435/02/3 and 1289 (dotted) and M85/00/2 and M435/02/3 (cross-hatched).
