You may soon be eating steak, chicken, pork or lamb made from human and animal genes.
Genes are the building blocks of life.
They control eye colour, height, intelligence, and a million other things that make us human. Scientists can swap genes from one person to another, between plants, animals or insects to see what happens. Salmon with extra mouse and human genes grow fast - up to four times normal size in a few months. Designer meat can be made by mixing our genes with animals to make superbreeds. Humanised cows, pigs, rabbits, sheep and fish have already been born - just some of 60,000 mutants made each year by British scientists.