2Q0E:
reference: Dual role of the RNA substrate in selectivity and catalysis by terminal uridylyl transferases., Stagno J, Aphasizheva I, Aphasizhev R, Luecke H, Proc Natl Acad Sci U S A. 2007 Sep 11;104(37):14634-9. Epub 2007 Sep 4. PMID: 17785418

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