1Q31:
reference: Crystal Structure of Tobacco Etch Virus Protease Shows the Protein C Terminus Bound within the Active Site., Nunn CM, Jeeves M, Cliff MJ, Urquhart GT, George RR, Chao LH, Tscuchia Y, Djordjevic S, J Mol Biol 2005 Jul 1;350(1):145-55. PMID: 15919091

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