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Pairwise dN/dS (the ratio of the number of nonsynonymous substitutions per nonsynonymous site to the number of synonymous substitutions per synonymous site) for all genes shared between photosynthetic orchids and Neottia and/or Rhizanthella. N/A indicates the cases where it was not possible to estimate the ratio due to the absence of synonymous substitutions or the absence of gene in the plastid genome.
