For plants designed in a lab a little more than a decade ago, they've come a long way: Today, the vast majority of the nation's two primary crops grow from seeds genetically altered according to Monsanto company patents.

Ninety-three percent of soybeans. Eighty percent of corn.

The seeds represent "probably the most revolutionary event in grain crops over the last 30 years," said Geno Lowe, a Salisbury, Md., soybean farmer.