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Distribution of coding sequences of Arabidopsis (A), P. tricornutum (B), maize (C), and C. reinhardtii (D and E) according to the GC1, GC2, GC3, and GCs levels. GC1, GC2, GC3, and GCs are the GC levels of first, second, and third codon positions and of the whole coding sequences, respectively. For C. reinhardtii, coding sequences derived from ESTs (D) and CDS (E) are shown. n is the size of the sequence sample.
