The eight distinct clusters of the 1439 differentially expressed genes determined by K-means with Euclidean distance. The y-axis corresponds to the difference of a gene relative to the mean expression of the gene in all samples on a log2-scale (values above zero-level represent up-regulation and below it down-regulation). The red lines represent the average expression pattern of each cluster. The x-axes are the 5 h and 24 h glucose and 72 h xylose samples (Glc5h, Glc24h and Xyl72h, respectively). The total number of genes in each cluster was: 484, 514, 127, 182, 22, 22, 34 and 54 for clusters 1 to 8, respectively.
Salusjärvi et al. Microbial Cell Factories 2008 7:18 doi:10.1186/1475-2859-7-18