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. 2016 Oct 27;7:1612. doi: 10.3389/fpls.2016.01612

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Copyright © 2016 Lourenço, Rencoret, Chemetova, Gominho, Gutiérrez, del Río and Pereira.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Side-chain (δ_C/δ_H 50–90/2.5–6.0) and aromatic/unsaturated (δ_C/δ_H 100–155/6.0–8.0) regions in the 2D HSQC NMR spectra of the milled lignin preparations isolated from the different parts of Q. suber (A,D) cork, (B,E) phloem, and (C,F) xylem. The signal assignments are presented in Table 3 and the main lignin structures identified are depicted in Figure 5.