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PPR protein diversity in gymnosperms. The stacked bar charts (central panel) represent the diversity of identified P‐class and PLS‐class PPR proteins, the latter including five subclasses. Correlations between the diversity of PLS‐class proteins and the abundance of RNA editing sites were examined using PGLS regression (left panel) with incorporation of a tree (right panel) inferred from the concatenation of shared mitochondrial and plastid genes.
