3F4D:
reference: Structural basis for thermostability revealed through the identification and characterization of a highly thermostable phosphotriesterase-like lactonase from Geobacillus stearothermophilus., Hawwa R, Aikens J, Turner RJ, Santarsiero BD, Mesecar AD, Arch Biochem Biophys. 2009 Aug 15;488(2):109-20. Epub 2009 Jul 16. PMID: 19615330

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