Disease	Trinucleotide Repeat	Mode of Inheritance	Mnemonic
Huntington disease	(CAG)n	AD	Caudate has ↓ ACh and GABA
Myotonic dystrophy	(CTG)n	AD	Cataracts, Toupee (early balding in males), Gonadal atrophy in males, reduced fertility in females
Fragile X syndrome	(CGG)n	XD	Chin (protruding), Giant Gonads
Friedreich ataxia	(GAA)n	AR	Ataxic GAAit