6TQO:
reference: Structure-Based Mechanisms of a Molecular RNA Polymerase/Chaperone Machine Required for Ribosome Biosynthesis., Huang YH, Hilal T, Loll B, Burger J, Mielke T, Bottcher C, Said N, Wahl MC, Mol Cell. 2020 Sep 17;79(6):1024-1036.e5. doi: 10.1016/j.molcel.2020.08.010. Epub, 2020 Aug 31. PMID: 32871103

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