Level of induction determined by Western blot using anti-GFP antibody. Lane 1–9: serial dilution of an extract from an induced transgenic plant. Dilution factors are: 1∶20, 1∶50, 1∶100, 1∶200, 1∶500, 1∶1,000, 1∶2,000, 1∶5,000 and 1∶10,000. Lanes 10–13: extracts from different noninduced transgenic plants. Lane 14: extract from WT plant.