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Figure 2 RNA blot with a dose-response experiment on salicylic acid-regulated genes in tobacco. A tobacco cell line (BY-2) was treated with different concentrations of salicylic acid (SA) or flufenamate (Flu) and collected for RNA isolation 5 hours later. The blot was hybridized with two tobacco genes (88) of unknown function, which exhibit different induction patterns. Whereas salicylic acid strongly induces the G8-1 gene, flufenamate is largely inactive in this response. In contrast, the C14-1b gene shows a reversed gene induction pattern with weak induction by salicylic acid and a strong increase in mRNA caused by flufenamate. The equal loading was verified by rehybridi-zation of the blot with a gene for the tobacco histone 1 (H1).

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