OLFM4 and autoimmune gastritis: To further validate our findings, we reanalyzed the scRNA‐seq data of human gastric mucosa samples with different lesions and mouse gastritis samples induced by Helicobacter pylori infection or autoimmune gastritis.[29, 32] These results validated that a subset of metaplasia cells expressed CSC‐related signature genes including SOX9, OLFM4, PROM1, and ANPEP (Figure S3 and S4, Supporting Information).