2GOP:
reference: The beta-propeller domain of the trilobed protease from Pyrococcus furiosus reveals an open Velcro topology., Bosch J, Tamura T, Tamura N, Baumeister W, Essen LO, Acta Crystallogr D Biol Crystallogr. 2007 Feb;63(Pt 2):179-87. Epub 2007, Jan 16. PMID: 17242511

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