Sorting and identification of MKN-45 GC stem-like cells. Note: (a), (b), flow cytometric sorting of CD133+ cells. (c), sphere-forming assay of CSCs (20 ×). (d), immunofluorescence assay for stem cell-specific protein expression (200 ×). (e), comparison of relative expression of miR-598 in CD133- and CD133+ cells. *, p < 0.05 vs. the CD133- cells.