1QMY:
reference: Structural and biochemical features distinguish the foot-and-mouth disease virus leader proteinase from other papain-like enzymes., Guarne A, Hampoelz B, Glaser W, Carpena X, Tormo J, Fita I, Skern T, J Mol Biol 2000 Oct 6;302(5):1227-40. PMID: 11183785

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