Table 2. General features of H. cetorum genomes.

Feature	MIT 00–7128, whale strain	MIT 99–5656, dolphin strain
Chromosome
Size bp	1 947 646	1 833 666
G+C content (%)	34,5	35,8
% Coding	88	88,4
Number genes	1 775	1 731
Protein coding	1 731	1 689
Structural rRNAs	38	36
16 S,23 S,5 S rRNAs	2,2,2	2,2,2
vacA	one next to cysS	one next to cysS, plus three divergent between ruvA, ruvB
cag pathogenicity island	Absent	absent
Urease	two: nickel & iron co-factored	two: nickel & iron co-factored
mobile DNAs	two TnPZ transposons; one near complete prophage with numerous rearrangements and insertions of probably non-phage DNAs	one IS605- and twenty IS606-like insertion sequences; one fragmented TnPZ transposon; multiple and duplicated prophage fragments
Plasmid	one, pHCW	one, pHCD
size (bp)	12 465	14 124
G+C content (%)	34,5	32,7
Number genes (orfs)	13	15
Other features	putative replication and transfer genes also present in dolphin strain plasmid	putative replication and transfer genes also present in whale strain plasmid; two IS606, nearly identical to chromosomal IS606