Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Change in gene expression in the exocrine pancreas during metamorphosis. (A–C) In situ hybridization with PDX-1 probes. PDX-1 is expressed exclusively in islet cells in the tadpole (A) and frog pancreases (C), and at climax expression is extended to the dedifferentiated exocrine cells (B). (D–I) Notch-1 (D–F) and Hes-1 (G–I) genes are activated at climax, although low level of expression of Notch-1 and Hes-1 has been observed at premetamorphic and adult frogs. (Scale bar: 40 μm.)
