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Box plots illustrating the distribution of pairwise ML distances between Amborella and each of the 20 sampled gymnosperm species and differences in heterotachous levels among 11 functional categories of 53 genes. The ML distances were calculated under a GTR + I + Γ model. The HBGP (defined as the mean substitution rate of gnetophytes minus the mean substitution rate of Pinaceae) of each category is indicated. Horizontal lines within boxes denote media.
