Table 3.

Comparison of SNP frequency and distribution of CDSs between Xcc 8004 and Xcc ATCC 33913

Groups^a	No. CDS	Total SNPs^b	A	S	Average SNP/codon (10⁻³)	A/S	P_I^c	P_II	P_III
I	269	1734	381	1353	1.656	0.282
II	163	1345	315	1030	2.739	0.306	0.3633
III	47	284	71	213	1.522	0.333	0.2902	0.6226
IV	19	185	39	146	1.439	0.267	0.8531	0.5390	0.3857
Sum	498	3548	806	2742	1.915	0.294

↵a Groups defined as (I) genes not involved in pathogenicity; (II) genes with undefined category and unknown-function; (III) genes whose products are virulence factors that interacted directly with host plant cells; (IV) gene that interacted indirectly with host cells, but is required for full bacterial virulence.
↵b (SNPs) single-nucleotide polymorphisms; (A) number of nonsynonymous SNPs; (S) number of synonymous SNPs; (average SNP/codon) ratios of total SNPs vs. total number of codons; (A/S) ratios of total nonsynonymous SNPs vs. total synonymous SNPs.
↵c P-values from χ² test for the difference in A/S ratios in all the pairwise comparisons among the four functional groups.

Comparative and functional genomic analyses of the pathogenicity of phytopathogen Xanthomonas campestris pv. campestris