Repeat unit CCG/CGG repeats 13 times in the reference sequence.
...GGCTGTCCTCAGAGCAGGTCTGGCGCGCCGGTGGCTGGACCGGCCCCAGGAGCCCAGTCACCGGGCGTCATTGGCTCAGGCTGCGGGGCCCTCGGCACCT
TCTCCCTCCCGGGTCCACCGCGGCGGCGGCGGCGGCGGCGGCGGCGGCGGCGGCGGCGTCAGGGGGCGGAGCCTGCCGAAGCGCCCTTTGTCTGCGGAGG
TGAGTGCGCGCCGGGAGGAGGCGGAGGCGGGAGGCGGAGGCGGGGGGCGGAGGCGGGGGGCGGAGGCGGGGGGCGGAG...