FIG. 4.

Sequence alignment of ryeA/ryeB chromosomal regions in LT2 and ΦW104 lysogen. Underlined triplets indicate the translation termination codon of yebY and the complements of termination codons of STM1871 (LT2) (12) and the ΦW104 int gene (MA7833). The sequence of the ryeB gene is in italics and shaded. Gene boundaries are inferred from the 96% identical E. coli sequence (19, 20). Facing arrows indicate the transcription terminator stem sequence. Green underlining indicates the sequence found duplicated at the two ends of the ΦW104 prophage. The left-pointing arrow defines the ryeA transcription start site. Purple boxes indicate ryeA promoter elements.