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Toxicogenomics studies that employ the polymerase chain reaction (PCR) technique evaluate the biological response to a toxicological challenge at the level of individual genes or a small set of genes. PCR is often used to test specific gene-level hypotheses related to a toxicological challenge or validate results from larger scale microarray studies. Data are reported as the expression of a number of genes related to toxicology under different conditions.
This data domain is part of Chemical Effects in Biological Systems (CEBS) database maintained by the National Toxicology Program.

At the link provided is a PDF and one or more folders containing data. The PDF describes the data, file types, and folder structure present.