Genetic modification is nothing new.
People have manipulated foods and food crops for millennia, through methods ranging from fermentation to classical selection. All living things contain DNA, and all DNA consists of the same four building blocks, known as nucleotides. The new gene merely prompts the modified organism to express a desired trait. Companies that wish to release a GM seed or the product of a GM crop are required to test the safety of that product. If the product is made from an organism containing a known allergen, it must be tested for safety.