The YokU-like protein family includes the B. subtilis YokU protein Swiss:C0H434 which is functionally uncharacterised. This family of proteins is found in bacteria. Proteins in this family are approximately 90 amino acids in length. There are two conserved CXXC sequence motifs. This is likely to be a family of bacterial antitoxins, as the sequence bears remote homology to the RelE fold family.