DDX53 and neoplasm: Synthetic peptides, 25 amino acids long, encompassing the five CT26-specific neo-epitopes were mixed (20 μg each) with 20 μg of OMVs from E. coli BL21(DE3)ΔompA and after tumor challenge the peptide-adsorbed OMVs were used to immunize mice in the presence or absence of Bifidobacterium administration (Figure 1A).