Maize has been genetically engineered (GE) in a number of ways to produce different types of GE maize, including pharm GE maize types, which produce pharmaceuticals in the plant. However, commercial GE maize consists of only two major types, herbicide tolerant (e.g. Monsanto's Roundup Ready) and insect resistant (e.g. Monsanto's MON810 and Syngenta's Bt11). These GE maize types have already been grown on a commercial basis in countries such as USA, Canada and Argentina. Contamination of non-GE maize has already occurred in these countries and there are concerns that insect resistant maize could be affecting wildlife.