Relative expression of phenylpropanoid-related genes in grapevine treated cell suspension cultures. PAL, C4H, 4CL, STS, CHS and CCR transcribed mRNAs were analysed by real-time quantitative RT-PCR. Levels of transcripts were calculated using the standard curve method with grapevine EFα1 gene as internal control. Values are given as the mean ± standard deviation of three replicates.