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. 2021 Apr 3;14:84. doi: 10.1186/s13068-021-01934-w

Fig. 5.

Fig. 5

General route of lignin valorization via biochemical system. Lignin is first depolymerized via microorganisms and funneling various lignin-derived aromatics into protocatechuate and catechol. The central intermediates can be eventually converted to value-added compounds via aromatic ring cleavage and TCA cycle