TABLE 1.

Bacterial strains used

Name	Comment(s)	Reference
S. typhimurium F98 (Nalr)	Wild type	44
S. typhimurium F98 (Spcr)	Wild type	44
S. typhimurium (Nalr) Tn5-TC1 mutants
17/12/90-117	rfbB::Tn5-TC1; no O antigen	This work
14/12/90-201	rfbB::Tn5-TC1; no O antigen	This work
30/11/90-85	rfbK::Tn5-TC1; no O antigen	This work
12/6/91-86	rfaK::Tn5-TC1; no O antigen	This work
7/12/90-66	No O antigen	This work
13/2/91-163	No O antigen	This work
5/6/91-184	No O antigen	This work
30/11/90-93b	No O antigen	This work
30/11/90-94	No O antigen	This work
14/12/90-7	rfaY::Tn5-TC1	This work
14/12/90-243	dksA::Tn5-TC1	This work
14/12/90-43	dksA::Tn5-TC1	This work
21/12/90-82	dksA::Tn5-TC1	This work
21/12/90-83	dksA::Tn5-TC1	This work
14/12/90-19	hupA::Tn5-TC1	This work
8/5/91-309	sipC::Tn5-TC1	This work
6/2/91-62	clpB::Tn5-TC1	This work
10/4/91-86	ptsC::Tn5-TC1	This work
14/12/90-14	ptsC::Tn5-TC1	This work
S. typhimurium F98 (Spcr) transductants
T14/12/90-7i	Transductant derived from 14/12/90-7	This work
T14/12/90-7ii	Transductant derived from 14/12/90-7	This work
T14/12/90-7iii	Transductant derived from 14/12/90-7	This work
T14/12/90-7iv	Transductant derived from 14/12/90-7	This work
T14/12/90-243	Transductant derived from 14/12/90-243	This work
T14/12/90-19	Transductant derived from 14/12/90-19	This work
T8/5/91-309	Transductant derived from 8/5/91-309	This work
T6/2/91-62	Transductant derived from 6/2/91-62	This work
T10/4/91-86	Transductant derived from 10/4/91-86	This work
S. typhimurium F98 (Nalr) defined mutants
rfbK	Kma insertion in rfbK	This work
dksA	Km insertion in dksA	This work
hupA	Km insertion in hupA	This work
sipC	Km insertion in sipC	This work
ptsC	Km insertion in ptsC	This work
E. coli strains
SY327λpir		29
SM10λpir		41

^aKm, kanamycin.