#：”P” are Putative genes which are VirB/D genes predicted based on genomic location and homology. Besides owning similarly sequences, these putative VirB/D genes are located nearby with each other in a genome island of chromosome. These genes have higher possibility to be functional T4SS Genes.
$: Homolog VirB/D Genes were predicted by T4SP program in bacterial genomes. They usually own similar protein sequences or functional domain with proven VirB/D genes. However their function needs to be further proven.
  Species name Genome ID   P# Homolog of VirB/D Genes$
          VirB1 VirB2 VirB3 VirB4 VirB5 VirB6 VirB7 VirB8 VirB9 VirB10 VirB11 VirD4
Anaplasma centrale str. Israel NC_013532 3 0 7 2 4 2 5 0 2 2 1 2 1
Helicobacter pylori P12 NC_011498 4 0 3 0 4 0 2 2 4 4 4 5 3
Neorickettsia risticii str. Illinois NC_013009 3 0 4 2 3 0 4 1 3 2 1 1 1
Rickettsia bellii RML369-C NC_007940 1 1 2 1 4 3 6 2 3 3 2 2 4
Rickettsia massiliae MTU5 NC_009900 1 1 2 1 3 2 4 0 2 3 2 2 2
Anaplasma phagocytophilum HZ NC_007797 3 0 8 1 4 0 4 0 2 2 1 3 3
Neorickettsia sennetsu str. Miyayama NC_007798 2 0 2 1 3 1 4 1 3 2 1 1 1
Rickettsia typhi str. Wilmington NC_006142 2 0 1 2 2 1 6 0 3 2 1 3 2
Rickettsia africae ESF-5 NC_012633 1 1 3 1 2 3 4 0 2 3 1 1 2
Ehrlichia chaffeensis str. Arkansas NC_007799 2 0 5 2 4 1 5 1 2 4 2 2 2
Xanthomonas campestris pv. campestris str. 8004 NC_007086 1 1 6 2 2 1 6 1 1 1 1 7 4
Rickettsia bellii OSU 85-389 NC_009883 2 1 3 1 4 2 5 2 2 3 2 1 4
Orientia tsutsugamushi str. Ikeda NC_010793 2 0 2 1 18 0 6 1 2 3 1 1 19
Helicobacter pylori B8 NC_014256 4 0 2 0 5 0 2 0 5 5 5 5 2
Xanthomonas campestris pv. campestris str. ATCC 33913 NC_003902 1 1 6 2 1 1 6 1 1 1 1 7 4