NCIt definition : Human FXN wild-type allele is located in the vicinity of 9q21.11 and is approximately
43 kb in length. This allele, which encodes frataxin, mitochondrial protein, plays
a role in transport and storage of iron and the assembly of iron-sulfur clusters.
Expansion of the intronic trinucleotide repeat GAA from 8-33 repeats to more than
90 repeats is associated with Friedreich ataxia.;