Ratio/intensity ( m / a ) plot deduced from DNA microarray hybridizations comparing the transcriptome of the zur mutant C. glutamicum JS2502 with that of the wild-type strain C. glutamicum ATCC 13032. Two biological replicates including label swapping were used for DNA microarray hybridizations. Genes showing significantly enhanced expression in C. glutamicum JS2502 are marked by black dots, decreased transcript levels are indicated by triangles, and genes without differential expression pattern are shown by grey diamonds. Genes were regarded as differentially expressed using the following cut-offs: m-value ≥ 1.0, upregulation; m-value ≤- 1.0, downregulation. The cut-offs correspond to relative changes in gene expression of at least two-fold.