SpCas9
Protein DomainSpCas9 is the Streptococcus pyogenes Cas9 CRISPR effector protein used for programmable genome editing and gene regulation. In the cited study, its activity was controlled indirectly by microRNA-dependent expression of the anti-CRISPR protein AcrIIA4, enabling cell-type-restricted activation of full-length Cas9, split-Cas9, and dCas9-VP64 variants.