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Substitution rates of plastid protein-coding genes in different Cycas taxa. a The estimations of nonsynonymous (dN), synonymous (dS) substitution rates of 47 Cycas. Taxon are grouped by sections; b the dN/dS of six sections of Cycas, c dN/dS of four major phylogenetic clades; d dN/dS of seven revealed phylogenetic subclades. See Fig. 3 for the definition of sections and phylogenetic (sub)clades
