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The relative expression to reference genes (RE = 1) for terpenes biosynthesis genes (A) GPPS-SSU, (B) FPPS, (C) MTS1, (D) MTS2, (E) STS1, (F) STS2, (G) TPS9, and (H) NES in young cones of HLVd-free and infected plants of hop cultivars. Probability level: *—p < 0.1, **—p < 0.05, and ***—p < 0.01. Note: straight line—median; dashed line—average; and box—95% percentile ± standard deviation.
