5Z9X:
reference: Structural and biochemical insights into small RNA 3' end trimming by Arabidopsis SDN1., Chen J, Liu L, You C, Gu J, Ruan W, Zhang L, Gan J, Cao C, Huang Y, Chen X, Ma J, Nat Commun. 2018 Sep 4;9(1):3585. doi: 10.1038/s41467-018-05942-7. PMID: 30181559

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