Comparative evaluation of three methylene dianiline isomers in the bacterial reverse mutation assay, the in vitro gene mutation test, and the in vitro chromosomal aberration test.

Abstract excerpt

4,4'-MDA is classified as a genotoxic carcinogen based on numerous in vitro and animal data. The consequential assumption that a safe threshold does not exist is not only applied to 4,4'-MDA but also to its structural isomers and impurities 2,2'- and 2,4'-MDA in the absence of substance-specific data. This constitutes a problem in human risk assessments for all three substances as the inherent risks of 2,2'- and...

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