6B3X:
reference: Reconstitution of the CstF complex unveils a regulatory role for CstF-50 in recognition of 3'-end processing signals., Yang W, Hsu PL, Yang F, Song JE, Varani G, Nucleic Acids Res. 2017 Nov 24. pii: 4647674. doi: 10.1093/nar/gkx1177. PMID: 29186539

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