Repeat unit AGC/GCT repeats 19 times in the reference sequence.
...CACCTCCTCCCTATGGCCGCCTCTTAGCCAACAGCAATGCCCATCCAGGCCCCTTCCCTCCCTCTACTGGGGCCCAGTCCACCGCCCACCCACCAGTCTC
AACACATCACCATCACCACCAGCAACAGCAACAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCATCACGGAAACTCTGGGCCCCCT
CCTCCTGGAGCATTTCCCCACCCACTGGAGGGCGGTAGCTCCCACCACGCACACCCTTACGCCATGTCTCCCTCCCTGGGGTCTCTGAGGCCCTAC...