Ultrastructural and Molecular Changes in the Developing Small Intestine of the Toad Bufo regularis

Figure 3

((a)-(b)) Photomicrographs of transverse semithin sections of stage 63 stained with Toluidine blue showing the apoptotic larval epithelium cells and cellular debris within the small intestinal lumen. S: serosa; C: circular muscle layer; Ct: connective tissue; P-AE: adult epithelial primordia; LE: larval epithelium; Sil: small intestinal lumen. The length unit for scale bars is millimeter.