Fig. 5.

Comparison of σ^B networks with and without negative feedback involving RsbX. These simulations were done under environmental stress conditions. The dynamic behavior of the concentration of free sigma factor in the reference (wild type) system with negative feedback (solid line); in the alternative system without feedback and the RsbX concentration kept constant at the pre-stress level of the reference system (dashed line); and in the alternative system without feedback and the RsbX concentration kept constant at the maximum-stress level of the reference system (dotted line).