FIG 6.

Heat diagram and time course for 55 genes upregulated (3.3-fold or more) in the optA1 gpt strain during the lethal phase of dGTP starvation. The boxes represent the results for the three replicate samples at each point. See the text for more details. The colors of the heat diagram represent the gradient of normalized expression (base 2 logarithm). Genes highlighted in red belong to the SOS regulon, with those representing the phage e14 genes underlined. The genes encoding ribonucleotide reductase subunits are shown in green.