Fig. 4From: The size diversity of the Pteridaceae family chloroplast genome is caused by overlong intergenic spacersComparison of (A) GC content and (B) number of repeats between overlong and non-overlong IGSs. (C) Correlation among SSRs, tandem repeats, dispersed repeats, and the length of overlong IGSs. *p < 0.05; **p < 0.01; ***p < 0.001Back to article page