Histochemical localization of GUS activity in
transgenic tomato, potato, and Arabidopsis. A, D, and G, Expression of
the Δgen1.1/GUS chimeric gene in seedlings of tomato; B, E, and H,
potato; C, F, and I, Arabidopsis. D through F, Stereomicroscopy images
of GUS-stained root tips. G through I, Bright-field microscopy images
of resin-imbedded cross sections of stained roots using Nomarski
optics. Bar in A and B = 2 mm; bar in C = 1 mm; bar in D and
E = 0.5 mm; bar in F = 0.2 mm; bar in G through I = 0.05
mm.