Asymmetric substitution patterns: a review of possible underlying mutational or selective mechanisms.

Abstract excerpt

In the absence of bias between the two DNA strands for mutation and selection, the base composition within each strand should be such that A = T and C = G (this state is called Parity Rule type 2, PR2). At a genome scale, i.e. when considering the base composition of a whole genome, PR2 is a good approximation, but there are local and systematic deviations. The question is whether these deviations are a...

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