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. 2017 Dec 1;6(4):99. doi: 10.3390/antiox6040099

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© 2017 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Simplified model of the tocopherol biosynthesis pathway in A. thaliana (highlighted branch of the pathway). Compound names are given in the boxes and gene names are indicated in italic. The circled numbers refer to the biosynthesis steps described in detail in Table 1. Adapted from [15]. HGGT: homogentisic acid geranylgeranyl transferase; HST: homogentisic acid solanesyl transferase; GGDP: geranylgeranyl diphosphate; MGGBQ: 2-methyl-6-geranylgeranyl-1,4-benzoquinol; PC-8: plastochromanol-8; SPP: solanesyl pyrophosphate.