Additional file 2.

Pair-wise dN/dS ratios of individual genes within the O-antigen loci. Pair-wise dN/dS ratios for the genes in the O-antigen loci of all the strains were calculated using PAML package with the Nei-Gojobori method. Each figure represents the following: BB0120 (A), wbmBB (B), wbmAA (C), wbmZ (D), wbmY (E), wbmX (F), wbmW (G), wbmV (H), wbmU (I), wbmT (J), wbmS (K), wbmR (L), wbmQ (M), wbmP (N), wbmO (O), wbmN (P), wbmM (Q), wbmL (R), wbmK (S), wbmJ (T), wbmI (U), wbmH (V), wbmG (W), wbmF (X), wbmE (Y), wbmD (Z), wbmC (AA), wbmB (AB), wbmA (AC), and wlbL (AD).

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Hester et al. BMC Evolutionary Biology 2013 13:209   doi:10.1186/1471-2148-13-209