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. 2015 Sep 17;8:151. doi: 10.1186/s13068-015-0334-8

Fig. 8.

Fig. 8

Two plausible explanations for an increase in the H lignin concentration in 4CL transgenic lines. a represents a putative increase in an activator located upstream of the enzyme 4CL, whereas b shows a putative decrease in an inhibitor located downstream of 4CL