Maximum likelihood tree of the aryl alcohol oxidase–pyranose dehydrogenase (AAO–PDH) cluster. Coloured circles and numbers mark the positions and counts of characterised enzymes in the tree. Right: Table of properties for the three defined clades of the tree. Listed organisms are sorted according to their appearance in the tree (top to bottom). 1—Mathieu et al. ; 2—Nagy et al. ; 3—Varela et al. ; 4—Galperin et al. ; 5—Fernandez et al. ; 6—Sygmund et al. ; 7—Gonaus et al. ; 8—Staudigl et al. ; 9—Kittl et al.