FIG.2.

Cluster analysis of differentially expressed B. anthracis genes. The relative expression levels of 2,090 differentially expressed genes are shown (rows) for each of the 20 time points examined (columns 1 to 20, from left to right). Times shown at top are those elapsed from the first time point. Up-regulated genes are green, while down-regulated genes are red. Color intensity is proportional to the level of regulation, with the most intense shades of green and red corresponding to induction and repression, respectively, greater than eightfold. Grey indicates missing data. Bars indicate the waves of gene expression discussed in the text. Expression profiles for each time point were measured in at least two independent hybridizations.