Figure 5
Complete linkage clustering analysis of genes with altered expression profiles in the Δ so2426 mutant. The 841 genes (out of the 4,648 represented on the microarray) exhibiting at least a twofold statistically significant (p < 0.05) change in expression for at least one of the time points during Cr(VI) exposure were analyzed by pairwise complete-linkage clustering. Transcriptional profiles are shown at 5, 30, 60, 90, 180 min, and 24 h post chromate addition. Individual genes are represented by a single row, and each exposure time interval is represented by a single column. Red represents induction, while green represents repression. Two noteworthy clusters (A and B) are indicated, with their respective expression heat maps enlarged.