COVID-19 is an emerging, rapidly evolving situation.

Get the latest public health information from CDC and research information from NIH.

U.S. flag

An official website of the United States government

Dot gov

The .gov means it's official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you're on a federal government site.


The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Share This:

TR-593: Technical Report Pathology Tables and Curves

Pathology Tables, Survival and Growth Curves from NTP
Short-Term and Long-Term Studies

Revisions to the 2,3-Butanedione Subchronic Study in Rats TDMS Tables: The number of 50 ppm male and female rats with eyes examined microscopically has been updated to 10 for males and 10 for females. No additional diagnoses have been made.


TR-593: 2,3-Butanedione


3-Month Study Tables - Rats

3-Month Individual Animal Data - Rats

3-Month Study Tables - Mice

3-Month Individual Animal Data - Mice


Chronic Study Tables - Rats

Chronic Individual Animal Data - Rats

Chronic Study Tables - Mice

Chronic Individual Animal Data - Mice