Figure 6-48.
Gut tube formation and liver budding. The endodermal sheet, gut, and liver were subjected to whole mount in situ hybridization using the foxA2 probe. (A–F) Dorsal views of medaka embryos at stages 21 (A), 22 (B), 23 (C), 24 (D), 25 (E), and 26 (F) with corresponding histological sections of the (a) esophagus and (b) rostral, (c) intermediate, and (d) caudal levels of the presumptive gut endoderm. Arrowhead, liver bud. (Kobayashi et al., 2006. Reproduced with permission of John Wiley & Sons, Inc.)