3BB7:
reference: A new autocatalytic activation mechanism for cysteine proteases revealed by Prevotella intermedia interpain A., Mallorqui-Fernandez N, Manandhar SP, Mallorqui-Fernandez G, Uson I, Wawrzonek K, Kantyka T, Sola M, Thogersen IB, Enghild JJ, Potempa J, Gomis-Ruth FX, J Biol Chem. 2007 Nov 9;. PMID: 17993455

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