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Histograms for codon frequency in C. reinhardtii. (A) Cytosolic codon usage. (B) Mitochondrial codon usage. For (A) and (B) codons have been grouped according to classical wobble rules and aminoacids are represented with the one-letter code. White (high frequency in the cytosol but weak in the mitochondria) and grey (low frequency in the cytosol but high in the mitochondria) arrow heads indicate some codons differentially used in the cytosol and mitochondria.
