FIG. 4.

Number and type of substitutions involving a specific amino acid. Comparative analysis of all types of genetic variants for all genotypes revealed 52 nonsynonymous variable sites in MOMP, representing 30 distinct types of amino acid substitutions. The size of each bar represents the number of times that a residue is replaced (in gray) or acquired (in black) among solely the 43 types of genetic variants (this excludes any bias due to the heterogeneous number of same-genotype variant specimens presenting that substitution). The number of ompA genotypes presenting that specific amino acid substitution is shown in parentheses above each bar.