PITG_22798-induced cell death in Nicotiana benthamiana. Images show cell death induced by PITG_22798 under white light (A) and UV light (B). Plant leaves were infiltrated with A. tumefaciens cells containing a potato virus X (PVX) vector carrying genes INF1 (positive control, OD600 = 0.4), PITG_22798 (OD600 = 0.4), or GFP (Green Fluorescent Protein) (negative control, OD600 = 0.4). All pictures were taken at 6 days post-infiltration (dpi). (C) The graph shows the percentage of inoculation sites showing cell death. Three N. benthamiana plants and four leaves per plant were used for each test. Values are means ± SD. The experiment has been repeated three times with similar results. Asterisks denote values significantly different from GFP (p < 0.01, t-test).