Table 1.

Restriction sites in selectable markers recognized by the four active type II restriction endonucleases in H. pylori strain 26695

Restriction endonuclease	Recognition sequence	No. of restriction sites
		cat cassette (1,189 bp)	aphA cassette (1,288 bp)
HpyAII	GAAGA	2	4
HpyAV	CCTTC	2	3
HpyAIII	GATC	1	7
HpyAIV	GANTC	1	7
Total		6	21