2PYH:
reference: Structural and mutational characterization of the catalytic A-module of the mannuronan C-5-epimerase algE4 from Azotobacter vinelandii., Rozeboom HJ, Bjerkan TM, Kalk KH, Ertesvag H, Holtan S, Aachmann FL, Valla S, Dijkstra BW, J Biol Chem. 2008 Jun 23;. PMID: 18574239

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