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Figure 2 Sequence logos for promoters of eight T7 group phages. The phage genome and the number of sites are given for each logo. In these sequence logos, the height of each letter is proportional to the frequency of that base at each position, and the height of the letter stack is the conservation in bits (43). The sine wave on each logo represents the 10.6 base helical twist of B-form DNA (36,44). Position –8 of T7 promoters faces the polymerase (88) (solid wave) while this has not been shown for other sites (dashed waves). Information content (Rs) was calculated from –20 to +5 for the upper six logos, –18 to +5 for the gh-1 logo and –17 to +4 for the K11 logo. Position 0 is the transcription start.
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