5AYJ:
reference: Hyperstabilization of Tetrameric Bacillus sp. TB-90 Urate Oxidase by Introducing Disulfide Bonds through Structural Plasticity., Hibi T, Kume A, Kawamura A, Itoh T, Fukada H, Nishiya Y, Biochemistry. 2016 Jan 15. PMID: 26739254

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