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Structure activity-based predictive toxicology: an efficient and economical method for generating non-congeneric data bases.

Starting with the results of the mutagenicity of 100 chemicals, we use CASE, a structure activity relational system, to select additional chemicals for inclusion into a data base. We demonstrate that a data base consisting of approximately 180 carefully selected chemicals is as predictive as the analysis based upon 820 'unselected' chemicals.