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Molecular assay reagents intended to identify GGGGCC repeat expansions in the chromosome 9 open reading frame 72 (C9orf72) gene, located at chromosome 9p21.2. Normal alleles of C9orf72 contain between 2 and 22 GGGGCC repeats; however, repeat expansion (up to 700 to 1600 GGGGCC repeats) may impair gene function and have been associated with amyotrophic lateral sclerosis.
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