Repeat unit T/A repeats 21 times in the reference sequence.
...TTTTGTGCTGCTTATTTCACTCGGCATAATGTCCCATCCATGCTGTAACATGTCAGAGGTTCCTTCCTTCTCAAGGCTGAGTAATATTCCACTGTCTTCC
ACCACGTTTTGTTTATCCATTCTTTTTTTCTTTTTTTTTTGAGACAAGGTCTCACTCTGTCACCCAGGCTGAATGAAGTGGTGCCATCATAGCTCACTGC
AGCCTCGACCCCCCCAGGCTTAGGTGATCCTCCCACCTCAGCCTCCTCAGTAGCTGGGAC...