Differential gene cassette expression under different stressors. The lower panel shows the differential expression of the first 26 gene cassettes in the Vibrio sp. DAT722 cassette array under increasing 30-minute oxidative stress. The upper panel shows the same area of the cassette array under various growth temperatures. In each panel, the x-axis denotes position in the gene cassette array. The vertical axis shows the relative expression of individual gene cassettes while the depth axis shows the different expression of each gene cassette at each stressor. It was noted that cassettes 21-24 were similarly expressed under the two stressors whilst the expression of cassettes 1-15 differed markedly.