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Huntingdon's disease and dystonia), scientists have already discovered a genetic marker on a chromosone very near the genes for those disorders.
Down's syndrome people have an extra chromosone that makes them different and, in my view, special.
Two years ago David and Zarinda Batstone were in despair when doctors couldn't find an intensive care bed for their five-day-old son Morgan, who was born with a rare chromosone abnormality.
Morgan was born with a rare chromosone abnormality which has led to substantial delays in his development.
The chromosone disorder, which causes mental and physical disabilities, was diagnosed when she was a year and nine months.
The condition - which is thought to be caused by a missing piece of chromosone 15 - is not inherited and occurs in both sexes.