2QVW:
reference: An unusual case of pseudo-merohedral twinning in orthorhombic crystals of Dicer., Macrae IJ, Doudna JA, Acta Crystallogr D Biol Crystallogr. 2007 Sep;63(Pt 9):993-9. Epub 2007, Aug 17. PMID: 17704568

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