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Expression of the endogenous hydroxylase genes ZmBCH1, ZmBCH2, ZmCYP97A, ZmCYP97B, and ZmCYP97C in 30 DAP maize endosperm, normalized against actin and relative to the expression levels in wild-type M37W maize and presented as the mean of three replicates ± SE. Abbreviations: ZmBCH1, carotenoid β-hydroxylase 1; ZmBCH2, carotenoid β-hydroxylase 2; ZmCYP97A/B, carotenoid β-hydroxylase; ZmCYP97C, carotenoid ε-hydroxylase.
