1IRQ:
reference: Crystal structure of omega transcriptional repressor encoded by Streptococcus pyogenes plasmid pSM19035 at 1.5 A resolution., Murayama K, Orth P, de la Hoz AB, Alonso JC, Saenger W, J Mol Biol 2001 Dec 7;314(4):789-96. PMID: 11733997

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