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Carotenoid biosynthetic pathway in wheat. PSY, phytoene synthase; PDS, phytoene desaturase; ZDS, zeta-carotene desaturase; CRTISO, carotene isomerase; LCYB, lycopene β-cyclase; LCYE, lycopene ε-cyclase; HYDB, β-carotene hydroxylase; CYP, carotenoid ε-hydroxylase (cytochrome P450 type).
