FIG 2.

Infectivities of TEV recombinant clones in which the NIb gene was relocated to different intercistronic positions in the viral polyprotein. Plots show the cumulative frequency of infection in wild-type (A) and transgenic (constitutively expressing TEV NIb) (B) tobacco plants versus days postinoculation (d.p.i.) with TEV-Ros1 and TEVΔNIb-Ros1-NIb1 to -9. Symptoms were screened at 7, 9, 11, 14, 16, 21, and 28 d.p.i. Error bars represent 95% confidence intervals of the estimated frequencies.