| C [auth E] | IPR055027 | CRISPR-associated endonuclease Cas9, C-terminal domain | Domain |
| C [auth E] | IPR013492 | CRISPR system subtype II-B RNA-guided endonuclease Cas9/Csx12 | Family |
| C [auth E] | IPR049465 | CRISPR-associated endonuclease Cas9, alpha-helical lobe | Domain |
| C [auth E] | IPR033114 | Cas9-type HNH domain | Domain |