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Thylakoid membrane lipids, comprised of glycolipids and the phospholipid phosphatidylglycerol (PG), are essential for normal plant growth and development. Unlike other lipid classes, chloroplast PG in nearly all plants contains a substantial fraction of the unusual trans fatty acid 16:1Δ3trans or 16:1t. We determined that, in Arabidopsis thaliana, 16:1t biosynthesis requires both FATTY ACID DESATURASE4...