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Mutant fractions (in pfu) induced by DB[a,l]P, NNN, and a combination of the two in the tongue of lacI mice. Background mutants (MF, 1.3 ± 0.6 pfu) were subtracted from the values in the figure. *, P < 0.05 versus the sum of individual mutant fractions of DB[a,l]P and NNN.
