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Molecular assay reagents intended to identify CAG repeats in the TATA box binding protein (TBP) gene, located at chromosome 6q27. Normal alleles have from 25 to 42 CAG/CAA trinucleotide repeats. A variation from the expected number of normal CAG trinucleotide repeat copies may produce altered DNA and improper gene functioning, resulting in full mutation. Alleles with from 43 to 66 CAG/CAA trinucleotide repeats have been associated with spinocerebellar type 17 (SCA17).
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