Assertion: lignin's unit | /r/HasProperty | incorporated into their complex structure
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Source sentences:
text: Native lignins are created via enzyme-mediated processes involving three primary hydroxycinnamyl alcohol precursors (monolignols), i.e., p-coumaryl alcohol, coniferyl alcohol, and synapyl alcohol, which lead to p-hydroxylphenylpropane (H), guaiacyl (G), and syringyl (S) structural units being incorporated into their complex structure (Boerjan et al.2003; Bonawitz 2010).