1HQM:
reference: Bacterial RNA polymerase subunit omega and eukaryotic RNA polymerase subunit RPB6 are sequence, structural, and functional homologs and promote RNA polymerase assembly., Minakhin L, Bhagat S, Brunning A, Campbell EA, Darst SA, Ebright RH, Severinov K, Proc Natl Acad Sci U S A. 2001 Jan 30;98(3):892-7. PMID: 11158566

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