CRISPR (Clustered Regularly Interspaced Short Palindromic Repeats) and associated Cas proteins comprise a system for heritable host defense by prokaryotic cells against phage and other foreign DNA; Multidomain protein with permuted HD nuclease domain, inactivated palm domain and Zn-ribbon; signature gene for type III
Jiyao W et al.(2023). "The conserved domain database in 2023.",