 The archaeon, Candidatus "Nitrosoarchaeum limnia", encodes adjacent genes designated Toxin Secretion/Lysis Holin.The "toxin" gene encodes a soluble protein of 325 aas stated as belonging to the "Glycosyltransferase GBT-type Superfamily".This protein brings up other glycosyltransferases in a NCBI BLAST search.