Table 1.

Potential SOS boxes of genes that bind or do not bind LexA repressor.

Gene	SOS box sequence	HI*	NM**
Consensus	TACTGTATATATATACAGTA		0
A. Genes whose SOS boxes bind LexA and are regulated by LexA represor
recA	TACTGTATGAGCATACAGTA	4.31	1
umuDC	TACTGTATATAAAAACAGTA	2.77	2
uvrB	AACTGTTTTTTTATCCAGTA	6.11	5
polB	GACTGTATAAAACCACAGCC	12.09	5
lexA1	TGCTGTATATACTCACAGCA	6.34	4
lexA2	AACTGTATATACACCCAGGG	8.32	6
B. Genes whose potential SOS boxes do not bind LexA but re not LexA regulated
intE	GGCTGCTGAAAAATACAGAA	16.04	7
ymfI	TTCTGTACCAGAAAACAGTT	15.48	8
ymfM	AGCTGCAGGAGCATGCAGCA	19.32	3
lit	TGATGACAGAGTGTCCAGTG	20.32	8
C. Genes whose SOS boxes do not bind LexA in spate of low HI value
yigN	AACTGGACGTTTGTACAGCA	9.27	5
dinJ	AGCTGAATAAATATACAGCA	7.06	3

Potential SOS boxes (sequence on coding strand) that bind (A), or do not bind (B and C) LexA repressor.

HI* denotes heterology index; NM** denotes the number of mismatches in SOS boxes deviating from a perfect palindrome. The lack of LexA repressor binding despite a relatively low HI value (section C) testifies that there is no direct correlation between them ²⁸. Anyhow, it indicates that the HI value cannot be the only indicator of the ability of an SOS box to bind LexA. The number of mismatches in the palindromic SOS boxes in each of the sections is similar, and does therefore not determine LexA binding ability with the SOS boxes. Data in parts A and C are from ref. 28, those in part B are from ref. 31.