Histogram of GC content for NADH and rRNA genes for 34 seed plant plastid genomes (see Table 2 for list of genomes). Taxa are arranged phylogenetically following tree in Fig. 8. A. GC content for 11 NADH genes, which includes average value for all codon positions, followed by values for the 1st, 2nd, and 3rd codon positions, respectively. B. GC content for four rRNA genes.
Cai et al. BMC Evolutionary Biology 2006 6:77 doi:10.1186/1471-2148-6-77