Table 1.

Gene Content of Hypervariable Elements in H1, H2, M4, and C6.^*

Isolate	Has CTX	Missing ORFs in VSP-II region	Missing ORFs in Superintegron	Missing ORFs in SXT_MJ-1236	Missing ORFs in SXT_CIRS101
Sample
H1 and H2	Yes	Yes†	Yes	Yes†	No
M4	Yes	Yes†	Yes	Yes†	Yes
N5	Yes	No	No	No hit‡	No hit‡
C6	Yes	Yes†	No	No hit‡	No hit‡
Reference genomes
CIRS101	Yes	Yes	Yes	ND	No
N16961	Yes	No	No	No SXT	No SXT
B33	Yes	No	Yes	No	No
MJ-1236	Yes	No	Yes	No§	No§

^*ND denotes not determined, and ORF open reading frame.

^†The missing regions are different in each of these.

^‡No hit indicates that no SXT ORF was observed.

^§Reference sequence comprises subsequences derived from MJ-1236.