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. 2008 Oct 20;117(3):392–399. doi: 10.1289/ehp.0800074

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Unsupervised two-way hierarchical clustering of 207 effects in rat (A) and 112 effects in mouse (B) with incidence > 5, for 310 chemicals with chronic/cancer toxicity data in ToxRefDB. Specific clusters or classes based on associated toxicities are indicated by the color-coded chemical dendrogram: seven clusters for rat, and six for mouse.