4MMH:
reference: Crystal Structure of Pedobacter heparinus Heparin Lyase Hep III with the Active Site in a Deep Cleft., Hashimoto W, Maruyama Y, Nakamichi Y, Mikami B, Murata K, Biochemistry. 2014 Feb 4;53(4):777-86. doi: 10.1021/bi4012463. Epub 2014 Jan 27. PMID: 24437462

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