Immunohistochemical analyses of Isl-1 expression with Ki67. (A–I) Immunostaining of Isl-1 and Ki67 in E14.5 stomach (A), E17.5 proximal intestine (B), E17.5 distal intestine, P10 stomach (D), P10 duodenum (E), P10 ileum (F), adult stomach (G), adult duodenum (H) and adult ileum (I). A: anterior, P: posterior. Arrows denote Ki67+ cells and * denotes Isl-1+ cells. Isl-1 and Ki67 staining were done on the same section and images were merged. Scale bars: 25μm.