RAG2 and hepatitis A virus infection: For example, Helicobacter hepaticus, a potential pathogenic microorganism that has been reported to induce colitis, hepatitis, and hepatocellular carcinoma in numerous murine models including A/JCr, SCID/NCr and RAG-2−/− mice failed to induce colitis or to potentiate colitis in conventionalized IL-10−/− mice [24].