Figure 2From: Highly expressed proteins have an increased frequency of alanine in the second amino acid positionNucleotide usage in the second codon of HEG. Nucleotide frequencies in all three positions of the second codon of HEG are divided by the corresponding frequencies of all genes. The asterisks mark significance probability less than 0.01 (H0: there is no difference of nucleotide frequencies between all genes and HEG).Back to article page