Updated project metadata. Temperate bacteriophages (prophages) have recently been demonstrated in Campylobacter jejuni. However, what they do there is largely unknown. In the series of studies that are the subject of these submissions we have investigated the relative expression levels of proteins in C. jejuni isolates that differ in the presence or absence of the CJIE1 prophage. At the time of the initial investigations whole genome sequence data were not available for the isolates used, though DNA microarray data indicated that the isolates were very closely related. The overall project was carried out through four separate experiments. In experiment 1, relative levels of protein expression of three isolates carryint the CJIE1 prophage were compared with one lacking the prophage after growth on Mueller-Hinton agar containing blood. Previous work in the scientific literature indicated that growth on medium lacking blood but containing sodium deoxycholate induced the expression of at least some proteins associated with virulence and provided data thought to be of relevance to the virulence of the bacterium. Therefore experiment 2 was done (previous submission) to evaluate in a single 4-plex iTRAQ experiment the effect of sodium deoxycholate on protein expression and whether the presence of the CJIE1 prophage had any effect. The third set of experiments (experiment 3) was done to consolidate the previous observations into a single experiment for a single strain. In three replicate experiments C. jejuni isolate 00-2425 was grown on Mueller Hinton (MH) agar base, MH agar + 10% blood, MH agar containing 0.1% sodium deoxycholate and, to further investigate the nature and extent of the bile response, MH agar containing 2.5% Oxgall.