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Table 3 Percentage of F. nucleatum ORFs classified by the taxa of potential origin.

From: Evolutionary relationships of Fusobacterium nucleatum based on phylogenetic analysis and comparative genomics

  Sequence similarity method (BLAST) Phylogenetic trees method Gene order conservation
Number of genes analyzed 2067 1236 738
Root of Firmicutes1 33.28 % 8.41 % 35.1 %
Inside Firmicutes2 12.92 % 25.8 % 15.45 %
CFB group 2.56 % 2.27 % 4.06 %
α, β, γ Proteobacteria 7.34 % 10.3 % 21.0 %
δ, ε Proteobacteria 5.07 % 3.4 % 5.7 %
Spirochaetes 4.35 % 4.32 6.37 %
Other eubacteria 3.58 % 4.53 4.2 %
Archaea 2.46 % 1.13 % 0.95 %
No hit, hit to eukaryotes, uncertain/unresolved 28.4 % 38.7 % 7.45 %
  1. 1 Genes consistent with the 16S-23S and ribosomal proteins phylogeny.
  2. 2 It indicates possible HGT to/from Firmicutes.