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Williams syndrome

Williams syndrome is a rare chromosomal condition, affecting about one in 25,000 people in the UK. People with Williams syndrome are usually missing a small part of chromosome 7, which probably causes the symptoms of this condition. These include some learning difficulties, slight muscle weakness and possible heart problems. Children with Williams syndrome may also be unusually talkative.

Chromosomes from a person with Williams syndrome, showing the gene (pink spots) missing from one of the pair of chromosome 7s.
Chromosomes from a person with Williams syndrome, showing the gene (pink spots) missing from one of the pair of chromosome 7s.
Jonathan Dore, Regional Cytogenetics Unit, St Mary's Hospital, Manchester.

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