Phylogenetic tree of TrpD sequences. N. punctiforme and Anabaena sp. each possess a set of three paralogs. The Asp_2 and Npu_2 paralog sequences were used for input into the concatenates of Fig. 2. In addition to the xenolog TrpD• domain of Cgl and Cdi that is present in TCG-1, Cgl and Cdi also possess 'remnant' TrpD proteins denoted Cgl_r and Cdi_r that cluster in TCG-5.