3IKW:
reference: Structural snapshots of heparin depolymerization by heparin lyase I., Han YH, Garron ML, Kim HY, Kim WS, Zhang Z, Ryu KS, Shaya D, Xiao Z, Cheong C, Kim YS, Linhardt RJ, Jeon YH, Cygler M, J Biol Chem. 2009 Oct 2. PMID: 19801541

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