FIG. 9.

Addition of exogenous cAMP changes the growth profile of a degP cyaA mutant strain grown at 42°C. The cell density of a degP cyaAΔ11 mutant strain (TS18A) grown in LB broth supplemented with 0 (♦), 1 (▪), 2 (▴), or 4 (×) mM cAMP and incubated at 42°C was determined. The growth curve of cyaA⁺ degP mutant strain TS2A grown in the absence of exogenous cAMP (○) is shown for comparison.