Illustration of putative operons of class B. For each experiment with the C. glutamicum RES 167 and its derived Δrel-mutant the induction or repression ratios are given. Bold numbers indicate a significant induction or repression of the corresponding gene according to the filtering criteria (5% error probability) applied on the microarray data. Genes are not drawn to scale. Known transcription start points are marked by small arrows. Predicted rho-independent terminators are indicted by hairpins.