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ABSTRACT
Azaperone was evaluated for its mutagenic potential by the Salmonella/microsome test. No mutagenic activity towards six S. typhimurium strains could be evidenced with azaperone at doses up to 2,000 µg/plate, either without or with metabolic activation at usual test conditions. Higher concentrations of liver post-mitochondrial fraction from Aroclor 1254 (ARO)-pretreated rats did not reveal any increase in the number of revertants towards S. typhimurium strains TA1537, TA1538 and TA98. Moreover, a plate-incorporation test with liver post-mitochondrial fractions from mice pretreated with phenobarbital (PB) and a liquid preincubation test with liver post-mitochondrial fractions from rats pretreated with ARO also failed to reveal any mutagenic action of azaperone towards S. typhimurium strain TA98. Thus, none of the tests used provided any indication of azaperone having a mutagenic action.