Predicted pore-forming effector domain observed exclusively in conserved genome contexts with the SMODS nucleotide synthetases and the bacterial Ubiquitin conjugation systems [1].

1: Comparative genomic analyses reveal a vast, novel network of nucleotide-centric systems in biological conflicts, immunity and signaling. Burroughs AM, Zhang D, Schaffer DE, Iyer LM, Aravind L; Nucleic Acids Res. 2015;43:10633-10654. PMID:26590262