This is a family of site-specific DNA endonucleases encoded by DNA mobile elements. Similar to Pfam:PF00961, the members of this family are also LAGLIDADG endonucleases.

1: Statistical modeling and analysis of the LAGLIDADG family of site-specific endonucleases and identification of an intein that encodes a site-specific endonuclease of the HNH family. Dalgaard JZ, Klar AJ, Moser MJ, Holley WR, Chatterjee A, Mian IS; Nucleic Acids Res 1997;25:4626-4638. PMID:9358175