Figure 3.

Frequency of twin sectors in RuvC-expressing Su/su plants. A picture of a twin sector is shown on the background of a light green (Su/su) tobacco leaf (Upper). The dark green and the yellow sectors are contiguous and probably were formed as a result of somatic crossover (17). The number of twin sectors was counted in 20 leaves per plant. (Lower) The average number of twin spots per leaf is shown with error bars representing the SEM. This average was calculated out of six T1 transgenic plants originating from independent transformation events of Su/su plants with RuvC (i.e., 6 × 20 = 120 leaves) and three Su/su nontransformed plants (i.e., 3 × 20 = 60 leaves).