This presumed domain is functionally uncharacterised. This domain family is found in bacteria and viruses, and is approximately 180 amino acids in length. The family is found to the N-terminus of Pfam:PF00004. There are three conserved sequence motifs: GWT, ELA and MGFW. Proteins in this family vary in length from 364 to 384 amino acids. The domains in this family vary in length from 177 to 180 amino acids.