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Expression of CAROTENOID CLEAVAGE DIOXYGENASE (CCD) genes in ‘Royal Gala’ apple. qRT-PCR expression of MdCCD7 and MdCCD8 in wild-type tissues. Values are means of three technical replicates ±SE, normalized to internal control genes and relative to MdCCD8 expression in roots. Tissues without bars had expression levels below the threshold of detection. The scale for MdCCD7 is on the right axis and for MdCCD8 is on the left.
