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, palm domain and Zn-ribbon; MTH326-like has inactivated polymerase catalytic domain; alr1562 and slr7011 - predicted only on the basis of size, presence of HD domain, and location with RAMPs in one operon; signature gene for type III; also known as Crm2 family
Jiyao W et al.(2023). "The conserved domain database in 2023.",