Repeat unit A/T repeats 21 times in the reference sequence.
...AGTAATCGGGTGATGTATGTGGACTGTGCACACCTCGTGGCAGAGGTGAAAATCATTTCGACAAGTCAAATATTGTCACAGGGAACAAATGGCTCTCCCT
GTTAATAAAAATTAATGAATTTTTTTTTTCTTTCTTTTTTCCTCGCCGCTGGCCTGCTAAATGAATCTGAGGGCAGCTGAGCGCGGACGGGCTGGGAAGG
GTTAAGTTCTTGATTCCGTGGTTAAAACTATGAACGTCTTCATCAGGGCAAGTGCGGCCA...