Repeat unit GCG/CGC repeats 13 times in the reference sequence.
...GGCTGTCCTCAGAGCAGGTCTGGCGCGCCGGTGGCTGGACCGGCCCCAGGAGCCCAGTCACCGGGCGTCATTGGCTCAGGCTGCGGGGCCCTCGGCACCT
TCTCCCTCCCGGGTCCACCGCGGCGGCGGCGGCGGCGGCGGCGGCGGCGGCGGCGGCGTCAGGGGGCGGAGCCTGCCGAAGCGCCCTTTGTCTGCGGAGG
TGAGTGCGCGCCGGGAGGAGGCGGAGGCGGGAGGCGGAGGCGGGGGGCGGAGGCGGGGGGCGGAGGCGGGGGGCGGAG...