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Phylogenomic relationship and evolutionary history of the five types of IR structure in Pedicularis sect. Cyathophora and other relatives (A). Variations of the IR region boundary and the distribution of accD, ccsA and NDH genes (B). Pseudogenes are marked by ψ in the open boxes, and direction of transcription is indicated by an arrow. The key ‘landmark’ genes, ndhA, ndhF and ndhH, are annotated in red font.
