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Relative transcript levels of carotenoid biosynthesis genes in transgenic Oncidium orchids. Transcript levels of the carotenoid biosynthesis genes. GGDS: GGPP synthase; PSY: phytoene synthase; PDS: phytoene desaturase; ZDS: zeaxanthin desaturase; LCY: lycopene cyclase. ZEP: zeaxanthin epoxidase. Gene transcript levels were measured by RT-qPCR. Transcript levels were calculated and normalized with respect to ubiquitin mRNA. The experiment was repeated three times.
