CAD and SAD activities of purified recombinant GH2 and gh2. A and B, HPLC chromatograms of GH2-catalyzing coniferaldehyde and sinapaldehyde to produce coniferyl alcohol and sinapyl alcohol, showing GH2 exhibits strong CAD activity and SAD activity; C and D, HPLC chromatograms of gh2-catalyzing coniferaldehyde and sinapaldehyde to produce coniferyl alcohol and sinapyl alcohol, showing gh2 completely lost the CAD activity and SAD activity. AU, Absorbance units; Cd, coniferaldehyde; Cc, coniferyl alcohol; Sd, sinapaldehyde; Sc, sinapyl alcohol.