2K0A:
reference: Solution structure of the U2 snRNP protein Rds3p reveals a knotted zinc-finger motif., van Roon AM, Loening NM, Obayashi E, Yang JC, Newman AJ, Hernandez H, Nagai K, Neuhaus D, Proc Natl Acad Sci U S A. 2008 Jul 15;105(28):9621-6. Epub 2008 Jul 8. PMID: 18621724

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