Redox-sensing transcriptional repressor rex 213 MKDKQFAIPKATAKRLSLYYRIFKRFHAEKIERANSKQIAEAIGIDSATVRRDFSYFGELGRRGFGYDVKKLMTFFADLLNDNSITNVMLVGIGNMGHALLHYRFHERNKMKIIMAFDLDDHPEVGTQTPDGIPIYGISQIKDKIKDTDVKTAILTVPSVKSQEVANLLVDAGVKGILSFSPVHLHLPKDVVVQYVDLTSELQTLLYFMRKED spr0998 REX_STRR6 rex Modulates transcription in response to changes in cellular NADH/NAD(+) redox state (By similarity).