Maximum likelihood tree of cinnamyl alcohol dehydrogenase (CAD) enzyme from the
-coumaryl alcohol biosynthesis pathway. Amino acid sequences were aligned with MUSCLE and the tree compiled using RaxML. Numbers above branches refer to bootstrap values above 50%. Sorbitol dehydrogenase, a CAD homolog , was used as the outgroup. The various classes of CAD are shown based on previous research, including the sinapyl alchohol dehydrogenases (SAD), which share some specific activity with CAD [40,41]. Gene names are included next to taxa when function could be predicted. * indicates that the gene has been biochemically characterized in this organism [31,42,71,74].