Fig. 1.

Morphological and histological changes of the X. laevis pancreas at different stages expressing GFP driven by the rat elastase promoter. (A–D) Stages of X. laevis metamorphosis. (E–H) Abdominal view of the pancreas observed by fluorescent microscope. (I–L) H&E-stained sections of pancreases at the corresponding stages. Expression of the elastase-GFP transgene had no effect on normal development and remodeling of pancreas. (Scale bars: A–D, 4 mm; E–H, 1 mm; I–L, 40 μm.)