Table 4.

Effects of radA, recX, and recAo1403 mutations on SOS expression in log-phase cells

Strain	Versiona of:			RFI	% >9-fold (18-fold)	Cells counted
	recAo	radA	recX
SS996	+	+	+	1.9	1.6 (0.7)	2,140
SS6088	1403	+	+	2.2	2.4 (0.6)	1,534
SS7102	+	del	+	2.9	4.5 (1.0)	1,254
SS6080	+	+	cat	2.9	4.4 (0.7)	995
SS7152	+	del	cat	2.4	3.7 (0.3)	1,532
SS7136	1403	del	+	6.6	23.3 (5.3)	1,399
SS7155	1403	+	cat	1.2	0.3 (0.0)	1,590
SS5841	1403	del	cat	5.8	24.2 (7.9)	1,704

^aAbbreviations are as defined for Tables 1 and 3.