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Comparative mutation frequencies in ndk and ndk mutY strains. The frequencies of mutations in the rpoB gene at five different sites are shown for both ndk (white bars) and ndk mutY (black bars) backgrounds (see also Tables 1 and 2). The five sites (left to right) are as follows: 1, A · T→T · A at bp 443; 2, A · T→T · A at bp 1532; 3, A · →G · C at bp 1532; 4, A · T→G · C at bp 1534; 5, A · T→G · C at bp 1547.
