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; Large proteins, some contain Zn-finger domain; signature gene for I-A subtype; also known as TM1802 family
Jiyao W et al.(2023). "The conserved domain database in 2023.",