4MG3:
reference: An open conformation determined by a structural switch for 2A protease from coxsackievirus A16., Sun Y, Wang X, Yuan S, Dang M, Li X, Zhang XC, Rao Z, Protein Cell. 2013 Oct;4(10):782-92. doi: 10.1007/s13238-013-3914-z. Epub 2013, Sep 11. PMID: 24026848

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