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Expression profiles of MeVINVs in leaves (a), tuber phloem (b) and tuber xylem (c) at tuber developmental stages in cassava. The amount of MeVINV mRNA was normalized by the tubulin mRNA, and the expression of MeVINV3 in tuber xylem at 90 days was used as a calibrator. Each value is the mean ± SE of three independent biological replicates. Letters on the error bars indicate the significant difference from each gene by ANOVA analysis (p < 0.05).
