MPs will vote today on whether to allow babies to be created using the DNA of three people, effectively creating a 'three-parent' baby.
Supporters of the controversial treatment say allowing faulty DNA to be replaced before birth would be a major step forward in preventing genetic diseases.
Critics argue the procedure would amount to creating 'designer babies' and state that no clinical trials to test the effectiveness on humans have been carried out.
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MPs have voted in favour of a ground-breaking but controversial technique that could see IVF babies conceived with DNA from three people.
A vote on three-parent babies, taking place today, could determine paediatric nurse Rachel Steel's chances of having her own healthy kids.
The parents of a baby with a life-limiting disorder say their future happiness will be decided by today's three-parent family vote.