11.   Biotech corn is more expensive than conventional varieties because of a special fee charged by the seed companies.

12.   Biotech corn not approved for consumer use contaminated some of the corn supply last year, prompting recalls of taco shells and other products.

13.   Biotech corn, called Bt corn, is designed to produce a natural pesticide that kills the European corn borer.

14.   Corn futures declined slightly, reflecting the lingering impact of concern over biotech corn and its possible effect on corn exports.

15.   Corn futures surged Monday in early activity on the Chicago Board of Trade following an agreement between Japan and the United States on biotech corn.

16.   Corn inched higher on reports that Japan has finally ironed out the details on testing U.S. biotech corn.

17.   Concerns that the controversy involving biotech corn could cut into U.S. exports sent corn futures slightly lower for a second straight day Thursday on the Chicago Board of Trade.

18.   Corn futures fell for the third straight day amid the lingering impact of concern over biotech corn and its possible effect on corn exports.

19.   EPA regulates use of the biotech corn because it was genetically modified to produce its own pesticide.

20.   It contains a bacterium gene that makes the corn toxic to an insect pest, and is one of the least-used varieties of biotech corn.