The deep phylogeny of land plants inferred from a full analysis of nucleotide base changes in terms of mutation and selection.

Abstract excerpt

The occurrence frequencies of nucleotide bases are biased to those of T and A bases even at third codon positions for conserved amino acid residues with fourfold degeneracy in the chloroplasts of land plants. Regarding this bias as the result of selection, the base changes at these positions are fully analyzed theoretically in terms of mutation and selection. Although the degree of bias is considerably different...

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