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Phenylalanine ammonia-lyase (PAL) catalyzes the initial step of phenylpropanoid biosynthesis in plants. Five PAL genes (PtrPAL1 to 5) have been identified in Populus trichocarpa. These genes are classified into two subgroups according to their transcript sequence similarity and tissue specificity. However, the regulation of these genes and their protein functions are not well understood. In this study,...
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