Repeat unit GCC/GGC repeats 4 times in the reference sequence.
...GCCCGGGAAAGTAAAGTTGGAGACGGAGGGAGCGCGCGGGCGCGGGGGCCCGGAGGAGCGGCGGCCGGCGCCCCGGCGCGCCGAGCCCTAGCCGGCCGGA
TGGGAGGCGGAGCGCCCGGGCCGCCGCCGCCTGTCGCCTGCGCCCCGGCTGGGCTCCGGGACCGCGGGGCCGCTCAGGCACGCCCGCTCGGGCGCCGCGT
CGCCGTGGGCTCGACGCCGGGGCGCTCCCCGTGAGCCGGGCCGAGGGCGGG...