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Trypan blue staining of tobacco leaves. (a) 8 week old wt N. tabacum, 10×; (b) 8 week old symptomless transgenic tobacco, 10×; (c) 8 week old symptomatic transgenic tobacco, 10×; (d) 8 week old symptomatic transgenic tobacco, 20× and (e) N. tabacum NN 7 days post TMV inoculation, 20×. Bars in (a) to (c) = 100 µm. Bars in (d) to (e) = 50 µm.
