si_0799 Tetrathionate_respiration Octaheme tetrathionate reductase si_0799 Tetrathionate_respiration Tetrathionate reductase sensory transduction histidine kinase si_0799 Tetrathionate_respiration Tetrathionate reductase subunit A si_0799 Tetrathionate_respiration Tetrathionate reductase subunit B si_0799 Tetrathionate_respiration Tetrathionate reductase subunit C si_0799 Tetrathionate_respiration Tetrathionate reductase two-component response regulator