Consistent with the mRNA expression profile in the stomach (Figure 1), immunoblotting analysis using an anti-CEACAM1 antibody, which recognizes both human CEACAM1 and mouse Ceacam1, revealed that the expression level of Ceacam1 in mouse gastric epithelial cells was much lower than the expression level of CEACAM1 in AGS human gastric cancer-derived epithelial cells (Supplementary Figure S1). The gene discussed is CEACAM1; the disease is gastric cancer.