Purity > 85% as determined by SDS-PAGE. MW: 43.3kDa. Full Length: 1-336aa. N-terminal 10xHis-tagged and C-terminal Myc-tagged. Arabidopsis thaliana (Mouse-ear cress). Catalyzes the formation of flavonols from dihydroflavonols. It can act on dihydrokaempferol to produce kaempferol, on dihydroquercetin to produce quercitin and on dihydromyricetin to produce myricetin. In vitro catalyzes the oxidation of both enantiomers of naringenin to give both cis- and trans-dihydrokaempferol.