CDC have been identified in bacteria of the B. cereus group. These proteins are named cereolysin O (Clo) in B. cereus, thuringiolysin O (Tlo) in B.thuringiensis and anthrolysin O (Alo) in B. anthracis [16, 17, 18]. We show here that three paralogous copies of an unannotated gene encoding a 26-amino acid peptide are present in the B. cereus ATCC 14579 genome [19]. One of these paralogues was co-transcribed with the gene encoding cereolysin O, and all three paralogues were expressed in a PlcR-dependent manner.