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A shift in the third-codon-position nucleotide frequency in alcohol dehydrogenase genes in the genus Drosophila.

Examination of the relative frequency of occurrence of alternative codons for any one amino acid (codon usage) for proteins within and among species suggests that codon usage pattern is a significant component of both genomic expression and expression of individual genes. This generalization implies a functional role of codon usage and that synonymous substitution rates may differ between lineages as a consequence. This could effect models constructed to estimate evolutionary as well as inferences regarding phylogenetic reconstruction.