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Enzyme activity of recombinant grapevine LAR (VvLAR1). HPLC chromatography of LAR reactions of E. coli transformed with a control pET plasmid (A) or the pET LAR1_Vitvi plasmid (B). The chromatograms show the elution profiles of the 3H-labeled reaction mixture obtained and processed as described in “Material and Methods.” The retention times for the substrate (leucocyanidin) and the product (catechin) are indicated by arrows.
