FIG. 1.

Genetic structure of homologous regions of the chromosomes of E. chrysanthemi and E. coli in the vicinity of the opgGH and mdoGH operons. Boxes represent open reading frames. Dark boxes represent the regions where the nucleotide sequences are 75% identical (on average) between both organisms. A restriction map is given at the top of the opgGH region of E. chrysanthemi. Transcriptional terminators of the opgGH and mdoGH operons are indicated by an inverted T. The horizontal dotted arrows indicate the location and direction of transcription of the genes. The solid circle upstream from opgG indicates the location of 13-bp direct repeats (see text).