In the Ames test, which result will indicate that the substance being tested is a potential carcinogen?
A) Appearance of a few spontaneous His+ reversion mutants on the control and experimental plates.
B) Appearance of abundant His+ reversion mutants surrounding the filter disk on the experimental plate relative to the control plate.
C) Appearance of no spontaneous His+ reversion mutants on the control plate.
D) Appearance of abundant His+ reversion mutants surrounding the filter disk on the control plate relative to the experimental plate.
Correct Answer:
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