Organization of dsb genes in the C. jejuni 81-76 chromosome and constructs prepared for dsb transcription studies; the dsbA2-dsbB-astA-dsbA1 gene set (A), the dba-dsbI gene set (B). Hazy grey boxes stand for C. jejuni genes (C. jejuni NCTC 11168 and 81-176 gene numbering is given above the boxes, below them the studied gene names are given). Black boxes stand for the C. jejuni 81-176 DNA fragments cloned in the transcriptional fusions with the promoterless lacZ gene, displayed by the light grey boxes. The longest transcriptional fusion could not be obtained. Sign β-gal +/- at the right side of the plasmid name stands for presence/absence of β-galactosidase activity conferred by the appropriate construct for the transformant cells.