Quantitative sequence analysis reveals positive selection for nucleotides surrounding translational start sites.

<p>−9 to +6 nucleotide frequencies (%) are presented for the consensus Kozak sequence and 7 model species. Yellow indicates positions with statistically significant selection (p<0.03). Frequencies are color coded on a 3 color gradient from 0% (red) to 25% (white) to >50% (green).</p>