TABLE 1.

rec and related mutations used in this study

Allele	Description	Source or reference
recB21∷IS186	IS186 insertion at codon 305	Schultz et al. (1983); Amundsen et al. (2000)
recC73	ΔT at codon 646	Schultz et al. (1983); Arnold et al. (2000)
recC1041	Trp841 → UGA841	Amundsen et al. (2002)
recC1010	Gly905 → Glu905	Chaudhury and Smith (1984b); Amundsen et al. (2002)
recC2710–C2718	ExoIII-generated deletions (see Figure 3)	Amundsen et al. (2002)
recC2725	UGA841 UGA842 plus C-terminal deletiona	This study
recC2726	UGA841 UAA842 plus C-terminal deletionb	This study
ΔrecC2730∷kan	Substitution of kan for recC ORF	This study
recD1013	Gln4 → UAA4	Chaudhury and Smith (1984b); Amundsen et al. (1986, 2002)
ΔrecBCD232	thyA–recBCD–argA deletion	Chaudhury and Smith (1984a)
ΔrecBCD234	recC–argA deletionc	Chaudhury and Smith (1984a)
ΔrecA∷kan	Substitution of kan for recA ORF	Reddy and Gowrishankar (2000)
recJ284∷Tn10	Tn10 insertion	Lovett and Clark (1984)
ΔxonA∷FRTkanFRT	Substitution of kan for xonA ORF	Feschenko et al. (2003)
sbcB15	Ala183 → Tyr183	GenBank accession AM235176

^aThe deletion leaves codons 1–840 intact.

^bThe deletion leaves codons 1–840 intact. An additional 6 bp specifying the KpnI recognition site (5′-GGTACC-3′) are 3′ of UAA⁸⁴².

^cThe deletion ends between codons 605 and 630 of recC (Figure 3; Amundsen et al. 2002).