Fig. 5.

Phylogenetic trees of semaphorins and plexins. Phylogenetic trees of choanoflagellate Sema-FN1 (A) and Plexin-1 (B) proteins. Trees based on 50% majority-rule consensus Bayesian inference from 2,902 aligned amino acids from available Plexin-1 sequences and 3,022 aligned amino acids of Sema-FN1 sequences. Branch lengths are proportional to the number of amino acids substitutions per site, indicated by the scale bar. Posterior probability values reached 1 for all nodes and are omitted for simplicity.