4XD9:
reference: Structural and functional analysis of the Rpf2-Rrs1 complex in ribosome biogenesis., Asano N, Kato K, Nakamura A, Komoda K, Tanaka I, Yao M, Nucleic Acids Res. 2015 May 19;43(9):4746-57. doi: 10.1093/nar/gkv305. Epub 2015 , Apr 8. PMID: 25855814

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