An official website of the United States government
Here's how you know
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.
Rat liver from day 28 during high dose NNM feeding, pulse labelling with [3H] thymidine. Thymidine incorporation in oval-shaped cells within the areas of ductular reaction (original magnification ×250, haematoxylin stain).