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Variation of Coptis plastomes. (A) Circos plot showing the indel and nucleotide diversity of Coptis. Circles from the outer to inner area show the following: structure of plastomes indicated by different colors, nucleotide diversity shown by a heatmap and indel count shown by a histogram. Window size of each grid is 500 bp. (B) Sliding-window analysis of the ycf1 gene. The most divergent region (top three region with Pi > 0.06) is indicated.
