TABLE 2.

Chromosome comparison between the sequenced Y. pestis strains^a,b

Chromosome characteristic	No. of IS elements for:
	Antiqua	Nepal516	91001	KIM	CO92
Total IS elements
IS100	75	32	30	34	44
IS285	24	25	23	19	21
IS1541	67	64	47	55	65
IS1661	10	8	8	8	8
Unique IS elementsc
IS100	39	4	15	6	13
IS285	2	4	11	1	1
IS1541	5	4	0	0	8
IS1661	1	0	0	0	0

^aMolecular groupings for the strains were 1.ANT, 2.ANT, 0.PE4, 2.MED, and 1.ORI for Antiqua, Nepal516, 91001, KIM, and CO92, respectively.

^bGenome sizes for the strains were 4,702,289, 4,534,595, 4,595,065, 4,600,755, and 4,653,728 bp for Antiqua, Nepal516, 91001, KIM, and CO92, respectively.

^cSome IS elements were shared between expected partners, such as three IS100 and one IS285 shared between Antiqua and CO92, as well as one IS100, one IS1661 and one IS1541 shared between Nepal516 and KIM. However, five exceptions were observed: one IS100 shared between 91001, Antiqua, and CO92 but not present in Nepal516 or KIM; one IS100 in 91001, Antiqua, CO92, and KIM but not in Nepal516; one IS285 in 91001, CO92, KIM, and Nepal516 but not in Antiqua; one IS1541 in CO92 and in Y. pseudotuberculosis IP32053; and one IS1541 in Antiqua and in Y. pseudotuberculosis IP32053.