Fig. 1. Transgene expression of T₁ plants. Average NPTII concentrations in relation to total soluble protein are shown for T₁ plants selected on kanamycin at 200 mg L^–1 (samples 13-16), 300 mg L^–1 (samples 17-20), and 400 mg L^–1 kanamycin (samples 21-24). An untransformed plant (ut) was used as a negative control. Histochemical GUS assay results are denoted below the corresponding sample number and were scored as either positive (+) or negative (–). Vertical bars indicate the standard error.