AtTPS1 gene expression analysis in WT and transgenic tobacco lines. A – Northern blot B – Western blot. In both cases, no AtTPS1 protein production was detected in control wild type plants while transgenic lines showed accumulation of AtTPS1 transcripts and enzyme. WT – Wild Type; B5A, B5H and B1F – Transgenic line. MW – Molecular weight markers (kDa).