3PS0:
reference: Structural and functional characterization of an archaeal clustered regularly interspaced short palindromic repeat (CRISPR)-associated complex for antiviral defense (CASCADE)., Lintner NG, Kerou M, Brumfield SK, Graham S, Liu H, Naismith JH, Sdano M, Peng N, She Q, Copie V, Young MJ, White MF, Lawrence CM, J Biol Chem. 2011 Jun 17;286(24):21643-56. Epub 2011 Apr 20. PMID: 21507944

This OCA Structure page
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