TABLE 7.

Frequency of occurrence of different nucleotides in the −35 region of promoters recognized by E-ς^Fa

Nucleotide	No. of occurrences at position:
	−35	−34	−33	−32	−31
G	26	1	0	0	4
A	0	1	24	0	17
T	2	23	4	28	7
C	0	3	0	0	0

^aThe data include 10 natural promoters (Fig. 1) and 18 promotors identified in the present study (Table 3).