Some features of the mutability of bacteria during nonlethal selection.

Abstract excerpt

We describe the mutability of the Trp(-) chromosomal +1 frameshift mutation trpE7999 during nonlethal selection, finding that the appearance of Trp(+) revertants behaves similarly to that of episomal Lac(+) revertants. In addition, we show that a feature of the Lac(+) and Trp(+) mutability is the accumulation of Trp(+) and Lac(+) revertants with additional unselected mutations, most of which are not due to...

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