Types
In over half of these disorders, the repeated codon is CAG, which in a coding region, codes for glutamine (Q), resulting in a polyglutamine tract. These diseases are commonly referred to as polyglutamine (or PolyQ) diseases. The remaining disorders repeated codons do not code for glutamine and are classified as non-polyglutamine diseases.
Read more about this topic: Trinucleotide Repeat Disorder
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—Michael Blankfort. Lewis Milestone. Johnson (Reginald Gardner)
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—Henry Brooks Adams (1838–1918)