An overview of prechronic and chronic toxicity/carcinogenicity experimental study designs and criteria used by the National Toxicology Program.

R S Chhabra

National Institute of Environmental Health Sciences, National Toxicology Program, Research Triangle Park, NC 27709.
J E Huff

National Institute of Environmental Health Sciences, National Toxicology Program, Research Triangle Park, NC 27709.
B S Schwetz

National Institute of Environmental Health Sciences, National Toxicology Program, Research Triangle Park, NC 27709.
J Selkirk

National Institute of Environmental Health Sciences, National Toxicology Program, Research Triangle Park, NC 27709.