si_0877 Phage_shock_protein_(psp)_operon Psp operon transcriptional activator si_0877 Phage_shock_protein_(psp)_operon Phage shock protein A si_0877 Phage_shock_protein_(psp)_operon Phage shock protein B si_0877 Phage_shock_protein_(psp)_operon Phage shock protein C si_0877 Phage_shock_protein_(psp)_operon Phage shock protein D si_0877 Phage_shock_protein_(psp)_operon Phage shock protein E precursor si_0877 Phage_shock_protein_(psp)_operon Phage shock protein E