Aventis CropScience said yesterday that it has confirmed the presence of Cry9C protein in test samples of a variety of corn seed that was not sold under the StarLink trademark. The corn seed was produced by Garst Seed Company, based in Iowa. Aventis CropScience performed the tests after several farmers stated that corn with no known connection to StarLink was testing positive for Cry9C. Under their licenses from Aventis, Garst and other corn seed producers were required to meet specific quality standards and to use the Cry9C technology only in varieties sold as StarLink. Aventis CropScience does not know how Cry9C protein came to be present in a variety other than StarLink brand seeds.