4AO5:
reference: Tying down the arm in Bacillus dUTPase: structure and mechanism., Garcia-Nafria J, Timm J, Harrison C, Turkenburg JP, Wilson KS, Acta Crystallogr D Biol Crystallogr. 2013 Aug;69(Pt 8):1367-80. doi:, 10.1107/S090744491300735X. Epub 2013 Jul 13. PMID: 23897460

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