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Table 1 Frequency of common patterns of single nucleotide differences

From: Genome-wide detection and analysis of homologous recombination among sequenced strains of Escherichia coli

Bipartition (Split) Pattern KOOCSS Number of SNDs Relative frequency
((KSSOO) C) 111211 50,354 38.73
((KSSC)(OO)) 122111 19,678 15.14
((KOOC)(SS)) 111122 18,490 14.22
(K(OOSSC)) 122222 14,115 10.86
((KSS)(OOC)) = KS 122211 9,882 7.60
((KOO)(SSC)) = KO 111222 6,890 5.30
((KC)(OOSS)) = KC 122122 5,874 4.52
  1. Common single nucleotide differences have two alleles. Each such nucleotide difference separates the six genomes into two classes. Pattern codes are represented as 6-tuples of ones and twos (for allele 1 and allele 2) in the following order: (K) E. coli K-12 MG1655, (O) E. coli O157:H7 EDL933, (O) E. coli O157:H7 Sakai strain RIMD0509952, (C) E. coli CFT073, (S) Shigella flexneri 2A 301, and (S) Shigella flexneri 2A 2457T. By convention, K-12 is always allele one. For brevity, key groupings are denoted as KS, KO, or KC. The remaining 3.6% SNDs come in over 50 different patterns, including one quadripartition. See appendix 1 in Additional data file 1 for additional frequencies.