There are many types of transgenic crops.

The transgenic crops in the news today were conceived by researchers 10 to 20 years ago.

Since the companies that provide the pesticides are the ones creating the transgenic crops, a conflict of interest has been observed.

It also invested in the production of transgenic crops, including rice and maize.

Permanent legislation on whether Brazil should commercialize transgenic crops is set to go before lawmakers.

Yet Brazil's increasingly powerful farming lobby, which says transgenic crops will generate 20 percent more revenue, looks likely to gain the upper hand.

Still others viewed the new study as a broader sign of the danger of transgenic crops and the need for tighter regulation.

Environmental issues associated with the use of these transgenic crops have not been fully resolved.

But in a transgenic crop, like Bt corn, it is prevented from breaking down.

Another major challenge is the increasing prevalence of transgenic crops with stacked traits.