 No plant products that use RNAi @-@ based genetic engineering have yet exited the experimental stage . Development efforts have successfully reduced the levels of allergens in tomato plants and fortification of plants such as tomatoes with dietary antioxidants . Previous commercial products , including the <unk> <unk> tomato and two cultivars of ringspot @-@ resistant papaya , were originally developed using antisense technology but likely exploited the RNAi pathway . 
