According to one study from the Agriculture Department, the top four seed companies controlled 54 percent of the global market in 2009, up from 21 percent in 1994.
Competitors like DuPont, which has countersued Monsanto on antitrust grounds, and some farmer groups object to Monsanto's licensing agreements with numerous small seed companies.
The lone table-ready GMO food Monsanto sells is virus-resistant squash, a product it inherited in 2005 with its acquisition of vegetable seed company Seminis.
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