In 2000, Aventis StarLink corn, which had been approved only as animal feed due to concerns about possible allergic reactions in humans, was found contaminating corn products in U.S. supermarkets and restaurants. This corn became the subject of a widely publicized recall, when Taco Bell taco shells were found to contain the corn, eventually resulting in the recall of over 300 products.[27][28] It was the first-ever recall of a genetically modified food. The registration for the Starlink varieties was voluntarily withdrawn by Aventis in October 2000.[29]