5M3F:
reference: Structure of RNA polymerase I transcribing ribosomal DNA genes., Neyer S, Kunz M, Geiss C, Hantsche M, Hodirnau VV, Seybert A, Engel C, Scheffer MP, Cramer P, Frangakis AS, Nature. 2016 Nov 14. doi: 10.1038/nature20561. PMID: 27842382

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