3JW4 TRANSCRIPTION REGULATOR, MARR, EMRR, TRANSCRIPTIONAL REGULATOR, DNA-BINDING PROTEIN, STRUCTURAL GENOMICS, PSI-2, PROTEIN STRUCTURE INITIATIVE, MIDWEST CENTER FOR STRUCTURAL GENOMICS, MCSG, DNA-BINDING, TRANSCRIPTION, TRANSCRIPTION REGULATION THE STRUCTURE OF A PUTATIVE MARR FAMILY TRANSCRIPTIONAL REGULATOR FROM CLOSTRIDIUM ACETOBUTYLICUM