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The relationship between gene expression level and codon usage in Neurospora species. (A) The mean ENCs for lowly (<10 ESTs per 100,000) and highly (≥10ESTs per 100,000) expressed genes. (B) The mean GC3 values for lowly and highly expressed genes. Error bars represent standard errors. Different letters (a or b) above bars indicate statistically significant differences (P < 0.05).
