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Comparison of IR/SSC boundaries among photosynthetic orchid plastomes. The pseudogenes are denoted by “Ψ.” JSA and JSb were stand for the junctions between IRA/SSC and IRB/SSC. The variable length of the 5′ end of ycf1 to JSA and the intergenic spacer regions adjacent to JSA and JSb are indicated. The most variable plastomes of Cymbidium tracyanum and Cymbidium mannii were used to represent the genus Cymbidium.
