cl00641: Cas4_I-A_I-B_I-C_I-D_II-B Superfamily (this model, PSSM-Id:412491 is obsolete and has been replaced by 469855)
CRISPR/Cas system-associated protein Cas4
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; Cas4 is RecB-like nuclease with three-cysteine C-terminal cluster