Lab tests have linked fumomnisins with cancer in animals. Studies show that most corn modified for insect for insect resistance has lower levels of fumonisins than conventional corn damaged by insects. However, biotech foods have had problems in the past. One problem occurred in the mid-1990s when soybeans were modified using genes from a nut. The modified soybeans contein a protein that causes reations in humans who are allergic to nuts. While this protein was discovered before any damage was done, critics fear that other harmful proteins created throgh genetic modification may slip by undiscovered. The techinque of moving genes acoss dramatically different spcies, such as rats and lettuce also makes critics nervous. They fear something could go very wrong either in the function of the iserted gene or in the function of the host DNA, with the possibility of unexpected health effects.