Figure 6.

Phylogenetic analysis suggests the “best-guess” root of the expansin family is between the α/β and γ groups. The analysis used five D. discoidium sequences as an outgroup. Only representative sequences from α, β, and all γ were included in this analysis (see Table S1 in the supplementary material). Bootstrap values are indicated against the appropriate branches. The major groups, α, β, and γ, are grouped as highlighted boxes. The lower support for the β subgroup (56% versus 77%) is due to the smaller number of alignable positions used in theses analyses.