Phylogenetic tree of TrpEa sequences. TrpEa proteins from Pae and Psy fall into TCG-3 instead of into TCG-2. Paralogs Asp_1, Npu_1, Asp_2 and Npu_2 were generated by a gene duplication that preceded speciation of Asp and Npu. Asp_2 and Npu_2 were arbitrarily used for concatenate input (Fig. 2). TCG-7 is not very cohesive.