Table 1.

Chloramphenicol-resistant (cat^R) colonies obtained after transformation with the flaA::cat, fldA::cat or porα::cat constructs

	Number of colonies after transformation with
H. pyloristrain	flaA::cat	fldA::cat	porα::cat
26695	500	2	1
26695	500–1000	0	1
26695	500	0	0
26695	1000–5000	0	0
503	100	2	0
503	85	5	0
504	100	0	0
504	128	0	0
69A	200	0	0
69A	500–1000	0	0
69A	500	0	0
888-0	>5000	2	30
888-0	1000–5000	8	7
888-0	1000–5000	1	0

Each line represents an independent transformation experiment.