This family consists of several phage and bacterial proteins of unknown function. Computational analysis involving sequence, predicted structure and genomic context suggests that these proteins may be endonucleases which function in phage genome segregation, or the repair of double-stranded breaks introduced during either this process or DNA replication [1].

1: Identification of novel restriction endonuclease-like fold families among hypothetical proteins. Kinch LN, Ginalski K, Rychlewski L, Grishin NV; Nucleic Acids Res. 2005;33:3598-3605. PMID:15972856