Fig. 1.—

Phylogenetic tree of the tubulin protein family. Unrooted ML topology generated under the WAG + Γ model in FastTree showing branch lengths for 75 α-, 69 β-, 84 γ-, 50 δ-, 45 ε-, 32 ζ-tubulins, 2 bacterial tubulins, 1 “artubulin,” 11 bacterial FtsZ, and 8 bacterial TubZ proteins. CD-Hit (70% identity) was used to obtain a representative data set for subfamily classification and visualization. Support for the major branchings indicating the grouping of the tubulins and FtsZ family members into different subtypes is given as likelihood bootstraps (FastTree). The scale bar corresponds to estimated amino acid substitutions per site.