Pigs and chickens that glow in the dark may signal a new era for the farm yard.
UK scientists at the Roslin Institute say they have dramatically improved the technique for introducing modifications to an animal's genetic make-up.
So far, the researchers have used the new method to introduce a jellyfish gene that makes their pigs and chickens fluoresce - to prove changes will work.
Now, the scientists expect to create animals that are resistant to disease or can be used to study disease.
The Edinburgh institute described its latest research to BBC Radio 4's One Man's Meat programme.
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