Abstract
Data on codon usage bias in E. coli are re-examined with respect to intragenic position. The bias is less extreme near the beginning than in the rest of the gene, particularly in highly expressed genes. This is contrary to the previous finding that there is a linear decline in codon usage bias with position along weakly expressed genes but little or no change in bias along highly expressed genes. The effect is not confined to genes coding for proteins with leader peptides, as suggested earlier (Burns and Beacham, 1985). There is some evidence of a similar but smaller effect in yeast.
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