It should be emphasised that present analysis findings are nonetheless quite preliminary and extra intensive analysis is needed to clearly present how abnormal phenylalanine ranges within the blood and brain may affect habits and educational efficiency. Scientists in India have delayed the ripening of tomatoes by silencing two genes encoding N-glycoprotein modifying enzymes, α-mannosidase and β-D-N-acetylhexosaminidase. The fruits produced were not visibly damaged after being stored at room temperature for 45 days, whereas unmodified tomatoes had gone rotten. In India, the place 30% of fruit is wasted before it reaches the market because of an absence of refrigeration and poor road infrastructure, the researchers hope genetic engineering of the tomato might decrease wastage. DNA Plant Technology , Agritope and Monsanto developed tomatoes that delayed ripening by stopping the manufacturing of ethylene, a hormone that triggers ripening of fruit.