Figure 7From: Using gene expression data and network topology to detect substantial pathways, clusters and switches during oxygen deprivation of Escherichia coliDuring anaerobic growth E. coli performed mixed acid fermentation, resulting in a more acidic environment. The histidine biosynthesis (blue bordered nodes and light blue box) was up-regulated for buffering (see text). For box colours see Figure 4. PPR: phosphoribosyl.Back to article page