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. 2019 Jul 9;10:884. doi: 10.3389/fpls.2019.00884

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Copyright © 2019 Meteier, La Camera, Goddard, Laloue, Mestre and Chong.

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) and the copyright owner(s) 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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Flavanol contents in hairy root lines. (A) Total proanthocyanidin contents were determined in 3-week-old hairy roots by the vanillin method. Results are expressed as absorbance units at 500 nm per g of fresh weight. Data are mean ± SD of n biological replicates (n = 6 for controls, n = 4 for VvSWEET4_OX). Means with different letters are significantly different at p ≤ 0.05 (Tukey Contrasts). (B–E): quantification by LC/MS of catechin (B), epicatechin (C), procyanidin B1 (D) and procyanidin B2 (E) in 3-week-old hairy root lines. Data are mean ± SD of n biological replicates (n = 3 for controls, n = 4 for VvSWEET4_OX). Means with different letters are significantly different at p ≤ 0.05 (Tukey Contrasts).