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. Author manuscript; available in PMC: 2019 Nov 1.
Published in final edited form as: Mol Cell. 2018 Nov 1;72(3):404–412. doi: 10.1016/j.molcel.2018.09.018

Figure 1.

Figure 1.

Type III CRISPR systems employ multiple-subunit crRNP effector complexes and function through both RNA and DNA targeting mechanisms. Target RNA binding by the crRNP effector complexes activates three distinct nucleases (two RNases and one DNase) that collectively destroy transcriptionally active target DNA and RNA substrates.