Fig. 2From: Genome-wide analysis of MAPKKKs shows expansion and evolution of a new MEKK class involved in solanaceous species sexual reproductionPhylogenetic analysis of the FRK class in solanaceous species. Phylogenetic relationships between members of the FRK class in A. thaliana, S. chacoense, S. lycopersicum, S. tuberosum and N. benthamiana. The four FRK subgroups are color coded in the tree. Gene IDs and locus tags can be found in Additional file 2: Table S2Back to article page