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The reaction is catalysed in vivo in the opposite direction to that shown. A multifunctional enzyme that also reduces (-)-pinoresinol [EC 220.127.116.11, (-)-pinoresinol reductase]. Isolated from the plants Thuja plicata (western red cedar)  and Linum corymbulosum .
the protein shows preference for (+)-pinoresinol (R,R configuration at C-atoms 8,8’) in the first reaction step, but preference for (-)-lariciresinol (S,S configuration at C-atoms 8,8’) in the second reaction step
the plasmid is transferred into the disarmed Agrobacter tumefaciens strain GV3101 by triparental mating with Escherichia coli strain HB101 and then introduced into Linum usitatissimum (cv. Barbara) transgenic plants
the expression of the PLR1 gene in the seed coat is up-regulated about 3fold by 0.1 mM exogenous abscisic acid. There is a high mid-maturation expression of PLR1 gene between developmental stage 2 and stage