6GTC:
reference: Conformational Activation Promotes CRISPR-Cas12a Catalysis and Resetting of the Endonuclease Activity., Stella S, Mesa P, Thomsen J, Paul B, Alcon P, Jensen SB, Saligram B, Moses ME, Hatzakis NS, Montoya G, Cell. 2018 Dec 13;175(7):1856-1871.e21. doi: 10.1016/j.cell.2018.10.045. Epub, 2018 Nov 29. PMID: 30503205

This OCA Structure page
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