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The unstoppable death of brain cells in Huntington's leaves patients in permanent decline, affecting their movement, behaviour, memory and ability to think clearly.
Peter, from Essex, told me: "It's so difficult to have that degenerative thing in you.
"You know the last day was better than the next one's going to be."
Huntington's generally affects people in their prime - in their 30s and 40s
Patients die around 10 to 20 years after symptoms start
About 8,500 people in the UK have Huntington's and a further 25,000 will develop it when they are older
Huntington's is caused by an error in a section of DNA called the huntingtin gene.
Normally this contains the instructions for making a protein, called huntingtin, which is vital for brain development.
But a genetic error corrupts the protein and turns it into a killer of brain cells.
The treatment is designed to silence the gene. This is how it works:
The instructions for making huntingtin are locked away inside the DNA in a cell's nucleus.
Those blueprints have to be carried to a cell's protein-making factories and that job is done by a short strand of genetic code, called messenger RNA.