5GUH:
reference: Crystal Structure of Silkworm PIWI-Clade Argonaute Siwi Bound to piRNA., Matsumoto N, Nishimasu H, Sakakibara K, Nishida KM, Hirano T, Ishitani R, Siomi H, Siomi MC, Nureki O, Cell. 2016 Oct 6;167(2):484-497.e9. doi: 10.1016/j.cell.2016.09.002. Epub 2016, Sep 29. PMID: 27693359

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