Among the 19 protein coding genes containing amino acid positive sites, it was found that the ycf1a gene located in the IR region harbored the highest number of positive selection sites (113), including 34 significant positive selection sites and 79 extremely significant positive selection sites, followed by rpoC2 (100) and ycf2 (96).
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Comparative chloroplast genomics of 24 species shed light on the genome evolution and phylogeny of subtribe Coelogyninae (Orchidaceae).
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