2PY4:
reference: Active site of mycobacterial dUTPase: structural characteristics and a built-in sensor., Varga B, Barabas O, Takacs E, Nagy N, Nagy P, Vertessy BG, Biochem Biophys Res Commun. 2008 Aug 15;373(1):8-13. Epub 2008 Jun 2. PMID: 18519027

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).