Repeat unit A/T repeats 21 times in the reference sequence.
...CAGCCCAGAACATCCCACCCTTTCCAGACCGAAGGGGTGTGGATTGTCCTGGGACCCTGGTCATTGGGGTCATCCGCTAGTCGCAAAGGACGGCAATGCC
TGTGGCCTCTCTTTCTTTCTTTTTCTTTTTTTTTTTTTTTGAGACGGAGTCTCGCTCTTGTGCAGAGAGCAGTGGCGCGATCTTGGCTCACTGCAACCTC
CGCCTCGTGGGTTCAAGCGATTCTCCTGCCTCAGCCTCCCGAGTAGCTGGGATTACAGGC...