PR transcript levels are upregulated in MIM159 and mNtGAMYB2 tobacco. A, RT-qPCR measurement of PR gene mRNA levels in the wild type (WT; three lines) and MIM159 (five lines), using leaves of 8-week-old plants. B, The same levels measured by RT-qPCR in mGAMYB2-N (N1 and N2) and mGAMYB2-S (S1–S3), using leaves of 12-week-old plants. RNA levels were normalized to PROTEIN PHOSPHATASE2A, and measurements are the average of three technical replicates.