What they say could pave the way to a landmark change in the law as early as next year that would affect future generations.
The controversy surrounds "uncharted territory" techniques aimed at preventing a special category of diseases caused by inherited genes.
They involve children being conceived with the help of a third genetic "parent" - a woman whose donated egg provides a source of replacement healthy DNA. A baby created this way would have a full compliment of nuclear DNA from its mother and father, plus a tiny amount of donated mitochondrial DNA.

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