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1 Users Guide). The intensities were linearly scaled so that the median was 100. For each position to which a probe pair mapped, a data set was generated consisting of all pairs mapping within a window of ��30 base pairs. The pseudomedian was calculated in a sliding window across the genome as an estimate of the signal intensity of the probe position. We used the median signal intensities of the probes located within each gene as an indicator of the expression level. Data were visualized using the IGB package (Affymetrix). Two independent RNA extractions were [http://en.wikipedia.org/wiki/PSCD4 CYTH4] done for each strain, and the transcription values of each gene (median of the signal intensities of the probes covering the gene regions) between the two samples showed >0.96 correlation [http://www.selleckchem.com/products/MK-1775.html find more] with each other (Fig.?S1). In particular, transcription values greater than 26?=?64 showed a high correlation (r?>?0.98) with each other, while those less than 64 showed a low (r?[http://www.selleckchem.com/products/KU-55933.html KU-55933 molecular weight] with their degrees of differential expression using the weighted average difference method (Kadota et?al., 2008) (Table?S2). All analyses were performed with custom-written software in the language and statistics environment R (R Development Core Team, 2008). The R-codes used to analyse these data are available upon request. The numbers of ORFs in each host strain after rRNA, tRNA and/or small RNA removal were 5398 (KT2440), 5563 (PAO1) and 5738 (Pf0-1), based on the genomic data (http://www.pseudomonas.