Fig. 5.

Distribution of the GC content in the third codon position among different groups of rice genes. Only those genes which have mRNA evidence in TIGR version 5 annotation (total 23,721 genes) were considered. GC3 distribution of these genes has two peaks at about 0.5 and 0.9. Genes without introns (4,452) are more prevalent in the high GC3 peak. Genes sharing similarity with Arabidopsis (blast P-value < 1.e-50, best reciprocal hit, 7,924 genes) are mostly in the lower GC3 peak whereas genes (1,664) similar to Myxobacteria (blast P-value < 1.e-3 and not matching Arabidopsis) are mostly in the high GC3 peak. 17,100 known protein sequences of the order Myxococcales from GenBank were used for comparison