1EF7: Crystal Structure Of Human Cathepsin X
reference: Crystal structure of cathepsin X: a flip-flop of the ring of His23 allows carboxy-monopeptidase and carboxy-dipeptidase activity of the protease., Guncar G, Klemencic I, Turk B, Turk V, Karaoglanovic-Carmona A, Juliano L, Turk D, Structure Fold Des 2000 Mar 15;8(3):305-13. PMID: 10745011

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