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Some of the enzymes (largest font) required for synthesis of carotenoids, the inhibition of which causes a white phenotype. Those in red are targets of synthetic herbicides. TAT = tyrosine amino transferase, HPPD = hydroxyphenylpyruvate dioxygenase, HST = homogentisate solanesyltransferase, SPS = solanesyl diphosphate synthase, PDS = phytoene desaturase, MSBQMT = methylsolanylbenzoquinone methyl transferase. Plastoquinone (PQ) is a PDS cofactor.
