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Frequency histogram of the cytosine–thymine–guanine (CTG) repeat length. The CTG trinucleotide repeat (TNR) length of the longest allele determined by direct sequencing and triplet repeat primed PCR (TP-PCR) in 54 subjects with Fuchs endothelial corneal dystrophy (FECD) and 54 non-FECD Thai controls is shown as a histogram. The distribution of TNR length in FECD cases was bimodal, and 14 patients harboured ≥100 CTG repeats
