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Bacterial test systems for potential carcinogens sometimes give false negative results. To overcome this problem, several short term test systems have been described. One of them is the DNA-synthesis inhibition test described by Painter (1977). Our DNA-synthesis inhibition test system using mouse L-cells gave positive results when monocrothaline, phenacetin and thioacetamide, which were negative in the Ames test, were tested.

Screening for Carcinogens by DNA-Synthesis Inhibition Test Using Mouse L-Cells