Monolignol transport and polymerization

Given that there are several monolignols and that these monolignols can be linked to each other in a number of different ways (see Chapter 1, section 3.12), the question arises how the plant is able to control lignin subunit 

The articles dealing with the dirigent model are of interest not only from a scientific but also from a philosophical viewpoint. In the case of the dirigent hypothesis a completely new model was proposed by extrapolating 

Theories are formulated after a process during which a new hypothesis is tested. The experiments that allow hypothesis testing are generally set up in such a way that a hypothesis can be disproved. Only after repeatedly being unable to disprove a hypothesis can one conclude that all the data support the hypothesis. At that point it becomes possible to predict the outcome of newly designed experiments. If the outcome is indeed consistently predicted correctly, it is appropriate to elevate the hypothesis to a theory. 

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