FIG. 2.
Microarray comparison of Salmonella serovar Typhi CT18 SPI-10 with different salmonellae. The microarray data image was constructed by using GeneSpring software. Functional groups into which the SPI-10 genes can be divided, the direction of their transcription (depicted by arrows for each gene), and the G-C content of this mosaic island (noted in red) are shown at the top. Each row of data is the result of challenging the microarray with 40 different Salmonella isolates, which are labeled along the right hand side and are described in Table 1. Each column represents a specific gene either within (STY4821 to STY4852) or on either side of (STY4820 and STY4853-56) the Salmonella serovar Typhi CT18 tRNAleuX island. The color scheme for the present/conserved or absent/diverged nature of the genes is displayed (bottom). The darkest blue corresponds to those genes that are considered absent/divergent with the highest degree of certainty. The brightest yellow corresponds to genes that are assigned present/conserved with the highest degree of certainty. Those regions that are orange are genes where hybridization with test DNA is higher than that of reference DNA. Grey indicates missing data. It can be seen that data for different strains of the same serovar are generally very similar, with one clear exception: Salmonella serovar Typhi strain KT516 (marked with an asterisk) does not contain an intact CT18-like P4 phage (STY4821 to STY4834).