A predicted Immunity protein, with a mostly all-alpha fold, present in bacterial polymorphic toxin systems as an immediate gene neighbor of the toxin gene [1] .

1: Evolution of the deaminase fold and multiple origins of eukaryotic editing and mutagenic nucleic acid deaminases from bacterial toxin systems. Iyer LM, Zhang D, Rogozin IB, Aravind L; Nucleic Acids Res. 2011; [Epub ahead of print] PMID:21890906