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.

Https

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:
Study Information
Study Attribute Value
CEBS Accession Number: 002-02756-0002-0000-4
Chemical Name: Pyridine
CASRN: 110-86-1
NTP Study Type: Genetic Toxicology - Mammalian Cell Cytogenetics
NTP Study ID: 148320_CA
Study Result: Negative

Study Result: Negative
Activation Trial Trial Call
No Activation  1  Negative 
Induced Rat Liver S9  1_S9  Negative 

Trial #:1   Activation: No Activation    Date: 09/19/1989    Harvest Time: 13.5 hour(s)   Trial Call: Negative   
  Dose
µg/mL		 Total
Cells Examined		 Total Aberrations Complex Aberrations Simple Aberrations Other Abs
No. of
Abs		 Abs
Per
Cell		 % Cells
With
Abs		 No. of
Abs.		 Abs
Per
Cell		 % Cells
With
Abs		 No. of
Abs.		 Abs
Per
Cell		 % Cells
With
Abs		 No. of
Abs.		 Abs
Per
Cell		 % Cells
With
Abs
Vehicle Control: Negative (Not Specified) 
0         
 200 0 0.000 0.0 0 0.000 0.0 0 0.000 0.0 0 0.000 0.0
Water 
0         
 200 2 0.010 1.0 2 0.010 1.0 0 0.000 0.0 0 0.000 0.0
Test Chemical: Pyridine 
503         
 200 0 0.000 0.0 0 0.000 0.0 0 0.000 0.0 0 0.000 0.0 
1081         
 200 0 0.000 0.0 0 0.000 0.0 0 0.000 0.0 0 0.000 0.0 
2325         
 200 2 0.010 1.0 2 0.010 1.0 0 0.000 0.0 0 0.000 0.0
Positive Control: Mitomycin-C 
 0.4       
 25 37 1.480 76.0 16 0.640 52.0 21 0.840 52.0 0 0.000 0.0
Trend: 0.000 0.000 0.000  
Probability: 0.500 0.500 0.000  


Trial #:1_S9   Activation: Induced Rat Liver S9    Date: 09/19/1989    Harvest Time: 13.3 hour(s)   Trial Call: Negative   
  Dose
µg/mL		 Total
Cells Examined		 Total Aberrations Complex Aberrations Simple Aberrations Other Abs
No. of
Abs		 Abs
Per
Cell		 % Cells
With
Abs		 No. of
Abs.		 Abs
Per
Cell		 % Cells
With
Abs		 No. of
Abs.		 Abs
Per
Cell		 % Cells
With
Abs		 No. of
Abs.		 Abs
Per
Cell		 % Cells
With
Abs
Vehicle Control: Negative (Not Specified) 
0         
 200 1 0.005 0.5 1 0.005 0.5 0 0.000 0.0 0 0.000 0.0
Water 
0         
 200 2 0.010 1.0 2 0.010 1.0 0 0.000 0.0 0 0.000 0.0
Test Chemical: Pyridine 
1081         
 200 1 0.005 0.5 0 0.000 0.0 1 0.005 0.5 0 0.000 0.0 
2325         
 200 1 0.005 0.5 1 0.005 0.5 0 0.000 0.0 0 0.000 0.0 
5000         
 200 3 0.015 1.5 2 0.010 1.0 1 0.005 0.5 0 0.000 0.0
Positive Control: Cyclophosphamide 
20         
 25 42 1.680 48.0 10 0.400 36.0 2 0.080 8.0 30 1.200 12.0
Trend: 0.509 0.201 0.633  
Probability: 0.305 0.420 0.263