Fig. 3

GC-content distributions of non-TE genes, MULE-derived putative genes, MULE internal sequences of MULE-derived putative genes, and the parental sequences of MULE-derived putative genes. Density distribution of GC content of non-TE genes (in purple), MULE-derived putative genes (in red), MULE internal sequences of MULE-derived putative genes (in blue), and the parental sequences of MULE-derived putative genes (in green). MULE-derived putative genes, especially the parts derived from MULEs, have a much higher GC content than non-TE genes across the 11 genome dataset (Wilcoxon rank sum test, P value < 2.2e-16). The GC content of MULE-derived putative genes is less than that of the MULE internal sequences of MULE-derived putative genes which is less than that of the parental sequences of MULE-derived putative genes (Wilcoxon rank sum test, P < 0.05, except for the comparison of MULE-derived putative genes and MULE internal sequences in L. perrieri and O. brachyantha)